Uhm... you're nearly 60, let's assume your daughter is in her thirties...
I had a hysterectomy and a stoma at the same time... my diagnosis was bladder cancer on top of a very bad case of endometriosis... so I already lived my adult life knowing it would be nearly impossible to have children... and was 48 when I had surgery.
Even being already in perimenopause... the first week or two was a rollercoaster of hormonal moods, laughing for silly things and crying a lot, just for someone being gentle or for a sentimental commercial on TV... you feel weird and out of control and it is sudden... and no substitute hormonal therapy possible, because of endometriosis...
So if she feels the same, tell her it's normal... my sister helped me find it normal by telling me how she felt after giving birth... same sudden hormonal changes...
Also, her belly will probably be huge, very swollen for up to four weeks...
Even without pain, I felt like a turtle on her back, unable to move the way I wanted and always felt ready to burst open... having a drain helped but still fluid was seeping from the stitches, especially once the drain was taken out and I got sent home...
Tell her it will pass, give it time and don't force recovery... walking a bit might help, but nothing wrong with laying down until she feels stronger...
Sleeping on her side will take close to two months... before it's comfortable again...
Tell her to come here and ask whatever she wants to know... or just to share with us how she feels...
You're doing the best you can, but she is the one feeling things... and we know what she feels... we can understand and help... and we will do it.