Yes this suggests she possibly has thyroid problem. She needs more than just TSH tested. Ask GP for further tests to recheck. Need Thyroid antibodies testing, plus FT3 and FT4. NHS rarely do FT3
Also test vitamin D, folate, ferritin and B12 as these are very commonly too low. They can be causing problems in their own right and/or upsetting thyroid too
If you can't get full thyroid and vitamin testing from GP
Medichecks Thyroid plus ultra vitamin or Blue Horizon Thyroid plus eleven are the most popular choice. DIY finger prick test or option to pay extra for private blood draw. Both companies often have money off offers.
All thyroid tests should be done as early as possible in morning and fasting.
(If she happened to be taking any supplements with biotin in- eg Vitamin B complex then must stop these 3-5 days before any blood tests. Biotin can falsely affect test results