From TFA, the judge ruled against her for lack of response to the suit. Actually rather correct of the judge, I'll bet what's left of my eye teeth that the RIAA did NOT say, "Oh, she's in and out of the hospital. Serving her was a real pain in the ass"...
The attorney that's taking her case said something about a 60 page service. Not clear when he got the docs.
So, start from the beginning. Check for defects in the proof of service then take it from there. IANAL, but I do follow this stuff as a, um, hobbyist.
Who knows, they might not have libeled her, but they might have defamed her character, so that action might just be possible. Will be fun to watch, break out the popcorn.