dumb question

[cyrus888]

my friend newly aquired an african spurred tortoise. he/she is about 2" in size but not too sure about the age. my question is, is it normal for them to be hiding in its shell most of the time and my friend said its not moving that much and its sleeping alot. im not too sure if its eating or not koz she's at work most of the day. her enclosure is a plastic tuperware about 2'x2' of space. the substrate is a mix of top soil and sand. she has a 100 watts heat lamp(red) on 24/7.