DD doesn't have a 2e issue which affects this, but she's just physically cautious. By the time she was ready to learn, she was tall and heavy enough that training wheels weren't a very effective thing.
We used one of these:
Balance Buddy and an inexpensive used bmx-style bike that was a smidge on the SMALL side for her.
We are fortunate to have a university nearby with lovely paved paths along large flat quads-- PERFECT for learning to ride a bicycle. It took a couple of weekend afternoons, but she was riding independently in just a few hours, really.
