Do you have any other hamsters in a different cage that you touch because hamsters usually squeak a lot when they smell another hamsters scent or she just does it.
Why Is My Dwarf Hamster Squeaking A Lot?
My Hamster Is the same way. When she makes that sound she is either sad or happy. You can tell when she is mad or just wants to get out her cage by when she escapes from the top of the tub that we have her in.