Honestly, and I say this with compassion, the biggest risk from this is that this is a scam. I have a vagina, and I can't imagine how I'd bottle any vaginal fluids. She could say it's from squirting, but how do you know it's not just something she bought for $1 at the store - something that could actually harm you if you use it on your skin or worse, ingest it?
Also, how would you know it's hers, and not someone else's? She can show you all the STD tests in the world, but maybe it's someone else's who has an STD, if she was able to collect any real body fluids?
Let's say it is body fluids - maybe even vaginal fluids somehow. How is she collecting them? Is it a sterile bottle? How is she shipping it? Will it be exposed to a lot of heat in the shipping process? What kinds of bacteria will grow in it, that you will then ingest?
If she says she squirted and collected that in a bottle, that contains urine. If she has a urinary tract infection, you are ingesting that bacteria.
https://www.webmd.com/sex/what-is-squirting-orgasm
https://www.healthline.com/health/drinking-urine
I don't mean to embarrass you. I want you to save your money, and protect you from any harm. Please reconsider doing this.