If there is a social cause, then society can work to undo it. If it is a biological cause, then we can stop wasting time and effort thinking it is a social cause.
First of all, we also need to consider the possibility that it could be BOTH. I.e., that certain gender stereotypes have some relationship to biological facts, and thus gender stereotypes end up having other effects which are not necessarily biological (but may be partly rooted in them).
The reason I bring this up is because it makes an interesting conundrum for these sorts of arguments. If something is entirely biological, there's supposedly no sense fighting it. (Of course, not all women are exactly the same, and some may have those "natural" biological elements emphasized to more or less degree in their talents and personalities.) But if something is entirely social, it's perceived as a gross injustice.
But what if we combine these? For example, someone earlier in this thread brought up the biological fact that women bear children and thus may need to take significant time off of work to have a kid and especially in the first year or two do things that only women can do (particularly nursing). If a woman wants to have more than one child, that can easily add up to 5-10 years of absence from the job force. In a fast-paced field, it may be difficult for women to then hop immediately back in to the job force with skills that are already starting to be outdated.
So, the issue here is not entirely biological (women could choose to forego children or dump their kid into daycare when he/she is a couple months old or women could actively try to keep up their skills even while not working full-time), but it's not entirely social either (men don't have the same hormones driving them to have children or nurse or be with infants). Yet we're still stuck with the problematic effects -- women will often get behind in their jobs or have trouble keeping up or returning to the workforce. We can't just blame it on biology, but it seems impossible to completely eliminate social issues that arise either.
But I bet that many women of her era would have convinced themselves that being a chemist was a foolish notion and wouldn't have pursued it at all. That's social self-regulation. That should be eliminated.
Obviously we need to eliminate actual ignorant prejudice. But the problems are often a lot more subtle than that these days. I know a lot of professional women who "came up through the ranks" in the 1970s, and they have horrific stories to tell about the kinds of indignities women suffered in the workforce back then. Let's not forget all the amazing progress we've made in a few decades... it's important to keep that in perspective.
Nowadays, we're mostly confronting those harder problems I mentioned earlier, like how to figure out a way to be "fair" in a workplace (and all the related decisions like salary, promotion, etc.) where one gender is more likely than the other to disappear from their career for 5-10 years at a time.
And we also have to deal with cases where "social self-regulation" actually does serve some important purpose. Sure, is it biologically possible for a woman to have a child and dump the infant in daycare almost immediately to be fed with formula? Yes, obviously. And lots of women do it because they have to.
But aren't there also psychological and perhaps social benefits to allowing women to choose to stay home and take care of a small child as they are biologically programmed to do? Moreover, aren't there also social benefits to having communities where children are raised by some parent (male or female) who can spend more time with them, rather than getting kids out of the home as quickly as possible and into large groups of kids often taken care of by people paid minimum wage? (Of course, some might argue the reverse -- that many parents are bad parents, and daycare may be helpful to the kids. Perhaps that's true in some cases, but shouldn't there be a choice? Shouldn't women feel that choice is reasonable too? But there are many feminists who go too far and actively discourage women from pursuing their own choices about wanting to raise a family more actively.)
These are difficult questions. And there aren't just a couple nice and neat categories where we can either say, "That's not a problem" or "We need to solve this and check off the social justice box for this issue."