Hi, I am completly new to Tortoises. I became the owner of a 9month old Spur Thighed one week ago. She seems to be a happy Tortoise very energetic eating well and loves to explore. Today i measuresd her by placing her on paper and measuring the straight legnth of her shell. I then weighed her.
She weighed 63 Grammes and measuresd 77mm, so her ratio works out at 0.13 which is under weight? I am so worried now thinking is she ill? Or is there something i need to do?

I would really apreciated some advise, she has a large outdoor enclosuer and comes in at night. She has a 100watt UVB light for the rainny days. I feed her a large range of foods which she really enjoys. She really seems happy and well so I am shocked that she has measured so underweight.