Aries,
But the onus is NOT on you to collect. That is out of your hands. The ONUS is up to them to pay.
Why do you feel that way? Would you say the same thing if it was a different type of debt, such as a loan, or compensation for a worker?
apushatayid,
If you feel so strongly that you were wronged, take them to beis din. Otherwise, forget about it.
I would think that beis din would be a last resort. She should first try to work it out with them.