I had this operation over 20 years ago but I don't think that anything's changed regarding recovery. I was off work for three months - that is normal. The thing about doing things too early, like driving, hoovering, carrying, stretching to get that pan off the shelf, etc. is that the stitching in the muscles can come undone, which results in another operation to stitch them back up. Ugh! IMHO it's just not worth it.
Good luck to your mum.