Shortness of breath w/exertion - pls help.

[Africangrey]

Looking for answers to shortness of breath w/little exertion for my mom. She was diagnosed in 2016 with Hashimotos. No longer has it. I think she is still hypothyroid and she lost weight, she is at 100 lbs. Hard to gain weight. Does anyone know how to gain weight safely and without eating junk.

[Nackapan]

Diary foods , pasta rice creamy sauces. Fruit juice; nuts . Has she had her iron levels checked? Also to get thyroid bloods cheked. Is she b12 deficient?

[Africangrey]

She doesn't eat dairy, no pasta, wheat, gluten, no sauce, no juice. No rice - arsenic contamination linked to bladder and lung cancer. She does eat some pecans - could that be a problem? PUFA oils in the nuts. Mostly avoids nuts and seeds because of the PUFA oils. Just coconut oil and GF butter. She is O- blood type. Thyroid was done in Sept '18 - not done properly - "doctor" didn't know what he was doing. Waste of blood and $$. Not doing anymore blood work until she gains 20lbs. She currently weigh 100 lbs. I think she is B12 deficient. Not sure about the iron, I'll have to look at the blood test. But that is not reliable. Blood changes every day. I think vitamin D3 may be low also, last check was at 35. She was using a liquid supplement, Vitamin A D K Thyroid formula from Forefront Health. Didn't seem to be absorbing it well. May need companion nutrients or take with fat to absorb? Do you know? Pls advise. Thanks.