3 year old possibly with holding at nursery - any tips?

[Yippieyay81]

Hi! My lg has recently finished a disimpaction regime as she had constipation linked to potty training. She is doing brilliantly...doing 1 poo a day at home (a few accidents but mostly in toilet/potty) & seems to recognise when she needs to go. However she is reluctant to poo anywhere but at home and I have concerns as she recently started nursery two days a week. Is there anyway of training her body to go first thing in the morning or in the evening when she is at home? I don’t want her to get stressed about not wanting to go at nursery or start withholding again. Would getting up earlier help? Adding Senna or prune juice on nursery days? She is currently on 1 sachet of Movicol per day. I’m also wondering if that needs to be increased on nursery days as I’m sure she won’t drink as much water as she does at home. Any advice gratefully received!