A couple things, mostly highlighted by the fact that it sounds like her coach is either unsupportive, unwilling, and or has given up.
First off, gold only requires a high bar dismount. I have seen athletes mount directly to the high bar and do their entire routine there. It's possible. Not common, but possible.
Secondly, there are a number of things that can be done. The bars can be brought closer together to make it more of a lean than a jump. We've done this for different reasons for different athletes. Mats can be stacked all the way under the bars and then one removed at a time until that confidence is built. I have had athletes jump down onto the mats, grab the high bar and just lift their legs to hang in quick succession just to get used to it. It can be spotted. Does she wear
grips? I've even don toe tape
grips for athletes who just needed to feel more comfortable.
When she had privates what did they look like? I have done privates for this and typically do the mat stack set up and spotting and every three catches we take a mat off the stack.
This is almost impossible to get over without the support of the coach.