care provider may be defrauding me, advise please

HI, I work as a care provider in San Francisco, CA. The lady i'm providing care for Is suppose to being paying me half of my income and the other half i get a check from the state (IHSS). At first she was paying me but later claimed that she was having financial problems and that she could pay me the full amount when she got a refund back from the state. But she recently told me she needs to keep most of that refunded money, offering me only a little, when i asked her to give me just 50percent, she changed her story and said that she wasnt getting a refund at all, and could pay me nothing.
She is on SSDI for back problems, im pretty sure she has full medical coverage. Is there a way i can find out if she is getting a refund. also, does she need my signature to get this refund. Im afraid she is making money off of me, in addition to the free care shes getting from me. what are my options, i dont really want to get her in trouble for fraud, so i want to be sure that she can get a refund back, before i do anything against her. please reply anyone who has advise. Paul Jones, (my email is Pauljonesnow@yahoo.com

the subject should read care recipient (not provider )