Interesting, I tend to be cold and think I am hypo though my bloodwork is normal. My thyroid is enlarged though and I am waiting for more tests. I do however sweat very easily and embarassingly profusely too. Its like I have a very small comfort zone temperature-wise.
I'm hot all the time too - but T3 T4 TSH are all in 'normal range.' I'm pretty discouraged about it.
Hyperthyroid can cause this. Not sure you age or situation but being premenopausal can also casue seats. The symptoms are similar with both. I have and had both and it is very fustrating. WIth premenopause the same things start hot sweats for me. If I can I try to sit down , have some cool water and wait a bit before moving around. If she thinks she has a thyroid problem you should be tested. I gyn can do test to see if you are perimenopausal. There are some natural things that are suppose to help with this.
Sorry about your problem. I have hypothyroidism and have the very same problems. I can not tell you anyway I have found to stop this, but I do know that it has effected my time out in the public. So I would like to know too.