Potty in public

Sarah

My 3 year old is fully potty trained at home but getting her to use the bathroom in public is a nightmare. I take her to the family bathrooms where it's just us and she still freaks out. I know she has to go to but as long as I leave her on the toilet she's screaming bloody murder. Anyone have any tips to help her feel more comfortable in public? We can never plan for long trips out of the house because she'll hold it in the whole time and I don't want her to get sick.