Your friend is being stubborn and that's a shame. It sounds like she recognizes her deficiencies are the root cause of her trouble, but she is unwilling to correct them. Yes it may set her back some in the near term, but her long term prospects would likely be better. Hard to believe she would prefer the wall she has hit.
I suppose she can hope not to play against an active volleyer. No way to know this ahead of time. Mix her returns with some lobs and hope for the best. Have her partner also play back so the net player doesn't crush her partner.