Thanks for sharing your story here.
I just wanted to point out that a lot of GA (Gamblers Anonymous) groups have a Gamanon (family and friends support) group running at the same time in a different room at the same venue.
Maybe, if this is the case where your Mom went, you could suggest that you go with your Mom, as a CG (Compulsive Gambler) I can understand your Moms hesitation in going through that door for the first time. However as with all support it will only work if your Mom seriously wants to stop gambling.
Great that you’ve found this place, lets hope your Mom starts to look for support too.