I am filing moms 2018 taxes, she passed 1/10/19. Can an adult dependent who was caregiver and only heir now claim her taxes?

I have always lived with my mother who had health problems since I was a kid. My dad and sister are deceased. For yrs I was still working too, but the past years she became perm disabled, physically and I have been her full time caregiver. Because we had her income only and she was paying for my car/health expenses and our home bills, she claimed me as a dependent and she was head of household. There were no problems. I will be keeping our home and continue livng here, I am about to turn 50 with my own pending physical disability case pending. I am e-filing her 2018 tax return from which I am the only person to receive refund. We have a joint bank acct. I was still listed as dependent and her head of household using the same filing site as always, it said the person claiming cannot also be the dependent. So, I edited to remove me as dependent and therefore it changed her from head of household to single and the refund was cut in half. Since right now I have no income yet and really need the higher refund. If I have my cousin or uncle claim it and keep me as dependent, I feel that might be fraudulent. Considering I was an adult daughter caregiver, could that help?