How to potty train a child with autism?

Any potty training tips for a child with autism/sensory issues? My daughter is 7 and still won’t ditch her diapers, she can go in the potty and do her thing but she doesn’t want to she wants the diaper on I think she feels more secure with the diaper she hates underwear and pull ups don’t really work, I would love her to be fully potty trained but it’s hard because I don’t know where to start I feel like I failed her, I’m a first time parent and struggle with how to go about these things.