Daughter having mastectomy

So sorry to hear this Nanabanana1, sending all good wishes to you and your daughter.
My suggestion (for what it's worth) is luxury toiletries - especially hand lotions and lovely fresh fragrances.
I was given a lovely bag of Molton Brown goodies by my partner after having a radical hysterectomy.

I know it might sound rather odd, but I very much enjoyed using them.
Of course, you don't need much in the immediate aftermath of a significant operation. However during my recovery at home, I made it a habit to have little treats and luxuries every day. Molton Brown hand lotion was one of those treats.

I hope your daughter has a successful outcome to her operation and you must also remember to look after yourself, in the middle of being a lovely supportive mum! ??

Well, I know what I would like:
www.toa.st/uk/product/womens+gowns/cdhtc/kantha+quilted+coat.htm?clr=CDHTC_Blues
But it is quite pricey. Otherwise, some nice loose lounging clothes for when she comes out of hospital. Some days she may not feel up to more than a little bit of exercise and a long lounge on the sofa reading and dozing.

A nice nightie or pjs, some wet wipes, dry shampoo, deodorant, a new pair of slippers, and a book or some magazines.

Some really nice moisturising body and hand cream. From another thread on mumsnet where people are in hospital a lot this is what they seem to appreciate. The hospitals are so overheated their skin gets dry. Also, one of those cooling water sprays you can buy.