[Vierville]

I'm so sorry to hear that your hamster is sick.

What type of hamster is she? How old is she?

Firstly, a hematoma is basically a very serious bruise so did she get injured?

Drinking lots of water can be a sign of diabetes. Do you feed her food that is high in sugar? This can even be fruit or certain vegetables like carrots which contain high amounts of sugar. These foods should not be fed to hamsters, especially dwarf hamsters.