I've been in a similar situation. My nine week old ball python's health was threatened by his lack of protein. He wouldn't eat anything for three weeks and weighed as much as a hatchling.. I went to my amazing vet and she recommended that I assist feed f/t until he ate on his own. If I hadn't done that, my snake might not have made it.
If you're sure it's not your husbandry or a health problem, then I would recommend assist feeding before she becomes too underweight.
To you people who say to never assist feed, I assist fed my snake twice and now he is eating on his own.. like a pig 😂