Have you tried alternative methods to her BP?

I'd get her some ester C, some turmeric, fish oil, and some magnesium glycinate.

Also add 8-12oz pomegranate juice per day and make sure she's eating kiwis, guavas, and any of the stone fruits

I bet her BP will go down and her performance will increase. Lots of coaches don't know anything about nutrition. You have a tall athlete running around 2-4 hours per day on top of her regular activity. Her calories are probably way too low and her electrolyte balance is probably out of order.

Maybe even just adding 300 calories of something like brown rice and a square or two of 90% cacao plus the magnesium will do the trick. Not denying the possibility it's congenital or something more mysterious but nutrition is always the first answer

High blood pressure is often due to a lack of specific minerals, Calcium, Magnesium and Potassium, etc. I recommend ORGANIC dairy and fruits/fresh pressed fruit juice over supplements.

Excess estrogen suppresses the thyroid, progesterone is needed to balance estrogen. Is your daughter's menst. cycle regular?

"The loss of control over the water in the body is the result of energy failure, and hypertension is one of the adaptations that helps to preserve or restore energy production.”

“Stereotypes are important. When a very thin person with high blood pressure visits a doctor, hypothyroidism isn’t likely to be considered; even high TSH and very low T4 and T3 are likely to be ignored, because of the stereotypes. (And if those tests were in the healthy range, the person would be at risk for the “hyperthyroid” diagnosis.) But remembering some of the common adaptive reactions to a thyroid deficiency, the catabolic effects of high cortisol and the circulatory disturbance caused by high adrenaline should lead to doing some of the appropriate tests, instead of treating the person’s hypertension and “under nourished” condition.” -RAY PEAT PhD.

https://www.functionalps.com/blog/2012/09/21/ray-peat-phd-on-high-blood-pressure/

have you had her aldosterone/renin ratio checked? sometimes there's a tumor on the adrenal gland that causes issues/raises BP. also check her renal function. I'm thin too and struggled with HBP, so we did a lot of tests.

Just start asking them invasive questions about their sex, personal, and medical lives;

Do you like anal?

Have you had all your MMR, TDAP, other vaccines? Have you been recently tested for TB & any STDS? ETC. ETC.

When they look at u like you’ve got 3 heads, tell them; “ that’s exactly my point”

Upload to Imgur or Google Photos or something like that. There are literally a billion photo sharing services; Flickr, Tumblr, etc. Most of them are usually pretty easy to figure out. 😎