Receiving Social Security Disability Benefits?

My mom has had SSDI for 8 years now. I've been disabled all of my life and currently recieve SSI, not SSDI since I've never been able to work. My mom and I both agreed that I should apply for benefits under her because Medi-Cal wasn't covering my needs like Medicare would.

I applied on April 2nd and was told I'd hear about it in a month. A month later I didn't hear from Social Security, but I did hear from my mom, complaining to me that they're going to garnish about $100 from her SSDI check. She didn't say anything else about it. My mom is extremely well, "money hungry". She has broken laws before in order to get more money for herself.

I tried calling SS office in my area and they told me they couldn't find anything in the system about it? Weird. I've left a few voicemails, but still haven't gotten a response. My question is, does my mom have the jurisdiction to deny me childrens' disability benefits? I was really hoping I can finally have my hip surgery so I can walk again
since Medi-Cal doesn't cover it, but now I'm not so sure. Any information is appreciated.