Re: Hoof pain
Can you please post current hoof pictures following the directions in the Wiki: https://ecir.groups.io/g/main/wiki/1482#Photos-and-Hoof-Evaluation-Help
If she's more comfortable in the boots, leave them on. If she's biting at them check to see if they're rubbing.
Insulinwise should provide your money back if you send it to them. If you decide to stop the Thyro-L you will need to wean off of it.
Thryo-L taper: https://ecir.groups.io/g/main/message/265797
How long has she been on weighed hay?