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! ??