Hey
Can you support her towards the independent activities, depending on her levels of anxiety etc, may depend on the level of support she needs.
For example is there a hobby you would both enjoy which would involve others also. You could go along together, and gradually you withdraw from conversations leaving her to carry on by herself.
Could she go to work experience with someone else she knows and trusts to build her confidence.
Are there any mentors in your area or within your family or friends.
For someone who excessive worries a good coping mechanism to try is to tell that person to write down every worry that pops into their head no matter how big or small, this could be on a phone, paper however they want.
They then have to tell them self not to worry about this now, it takes a bit of work, but every time it pops back up keep saying to yourself do not worry about this now its written down I will worry about it later.
At aprox the same time daily (ideally not just before bedtime), the person should get out their list and go through each worry.
Some of them may no longer be a worry, great forget about it and move on.
For each worry that is still causing concern, the person can ask themselves the following questions
Can I solve it?
The rest have popped out of my head- I will again post when I find them.
You should set aside 30 mins for this, so that the time becomes focused and meaningful.
At the end the person should do something they enjoy, e.g. a bath with their fave bubble bath, lighting a candle.
This should be a daily strategy, until (hopefully) the person no longer needs it.