love the dog
As oestrogen levels drop so muscles may become lax = aches and pains. Also, the body may become dry: skin, deep in the ears, eyes, nostrils, vagina ........ do wear our 'bladder issues' and 'vaginal atrophy' threads. Make notes.
Walking is fine. You should be able to continue with gentle yoga ........ it's about keeping bone strength to avoid osteoporosis. Jogging isn't good overall for joints ........ we are built 4 short bursts when running after food or away from the sabre toothed tiger ;-). We evolved upright - not a good idea!
Many GPs won't do extra thyroid function tests if results are 'within normal limits'. She should be doing a full blood count: thyroid function, VitD levels, iron levels ...... iron tablets can cause constipation
There are many kinds of HRT which can be confusing.