Encouraging 3.5 year old to use unfamiliar toilet

[Yippieyay81]

Hi all! My daughter is doing well after recent disimpaction following potty training constipation. She is on Movicol & when at home goes in the toilet. However she has an anxiety with using any toilet other than the one at home so if she needs to go when we are out she withholds. I’m particularly concerned as she is now at nursery 2 days a week. So far it’s been ok...she doesn’t poo on those days but I give her additional Movicol and add Senna to prevent her getting too constipated and then she goes back to normal after she’s done her two days at nursery that week. Has anyone got any tips? I’m hoping things will improve with time 🤞🤞