My daughter has been diagnosed with anxiety.
Almost at the very last things on the list of "what not to tell your anxious child", if I made such a list, would be: telling her to think way ahead to careers, and picking the activity (whether it's camp, a particular course at school, or a social activity) for your anxious child.
Right now, your daughter is displaying coping skills. She knows she has already taken this particular educational camp course. She knows what it entails. She knows she can handle it. And she's willing to do it. That's awesome! She's listening to herself.
The value you'll get from allowing her to repeat something that is comfortable for her is: confidence, an expanded sense of accomplishment, and knowing that she has achieved something. You can't put a price on that.
Believe me, it's frustrating. My daughter is an adult. Making a phone call is torture for her due to her anxiety. In order for her to make the call, we review the steps her psychiatrist has outlined (certain coping skills and tools), sometimes we write out a script of sorts, she relaxes and breathes, and then makes the call. Is this a call to the president of Harvard University? No, just ordering pizza. ARGGGHHHH sometimes I want to just pick up the phone and do it for her, but she needs to do it on her time. She is improving, due to following her psychiatrist's counseling. And I'm sure you're frustrated knowing that your daughter wants to repeat this camp, which will cost you money. I'm sure you're thinking "hey, honey, you're smart, you're not 7 years old anymore, time to think about college and/or a career and taking steps to get there, didn't you already do this camp, come on pick up the pace!". You may be thinking how when you were her age you were already applying to schools or had your life pretty planned out. But anxiety is a huge wrench in the works.
Now, if she wants to go to the same educational camp 8 years in a row, well, time to step in and have some tough conversations, guided by a professional.
But as a teen, wanting to try a repeat session at an educational program, handling anxiety as best she can, that seems ok.
A person with anxiety often will not speak up or just jump in and take control of things. I hope you will continue to get counseling for her, even if she doesn't speak to the counselor. My daughter didn't speak to her psychiatrist for 3 years. Don't give up, don't stress about the future, continue to recognize her accomplishments, and get counseling for yourself about how to effectively parent an anxious kid.