"Total knee replacement surgery"

My mom is day 3 post op following TKR and I am very upset with the way my mom has been made to feel. She feels as though she is a burden to the nursing staff on the wards due to their behaviour towards her when she asks for assistance. She has been left for long periods waiting for her buzzer to be answered and then told off when she rings again to chase up her request. I understand that they are busy but that doesn't mean my mom should suffer. This is day 3 and she has only seen a physio once and is supposed to be going home day 4. She has been in terrible pain and has asked twice for a doctor to review her pain relief but 19 hours later we are still waiting to hear the outcome. I think it's disgusting she has been left like this. And unfortunately she is due to have the same operation on her other knee later this year.