russian horsfield makes weird noises

by stuart white
(england)

My tortoise, which is a Russian Horsefield, female and 3 years old, has just started to make a squeaking noise. Not when she breathes but just now and again. We live in England so it is our Winter, she has been indoors and we have had a lamp on her all winter. She hasn't hibernated, but has been more docile.

Please HELP,
Stu.