How can i cash a tax return when my name is not on the check?

My moms tax check is coming in the mail but she is nowhere to be found. I was living in her house helping her with her bills because she lost her main job and needed help. This month I paid up all the bills and all she had to do was give me 300 for rent but she defaulted on it and ran off to another city and disconnected all means of possible contact from myself and anyone else we knew. Now her tax refund is finally coming but we are no longer living at the address that she gave the irs. We rrcieved a 3 day notice for eviction on the 16th and ironically that was th last time I talked to her. She was already giving me half and I plan on giving her the half she wanted but I have no way to contact or find her. I don't want this check to become voided and I really need the money becauseme and my 2 year old are living in a hotel until I can get the funds to find a new home. I have no family and a small amount of friends. My mom just left us high and dry and now most importantly my daughter needs a roof over her head and so do I. Is there anyway for me to cash it? I know my mom isn't coming back...I wouldn't be surprised if I never saw her again.