SSDI Check

My mom gas trust and she has been depositing my SSDI checks into her account for me for a few months now via mobile deposit. She deposited one on Feb 27th then got am email saying that there was a hold on the check and funds will be available on March 8th which is a Saturday. When calling they said that there was a hold placed because it was deposited into a 3rd party account and that there is nothing they can do about it. She has deposited so many checks for me with no problem, I need that money to pay my rent. Will is definitely be available on the 8th even though it's a Saturday? Anyone have this problem?