I think it's time to speak to a lawyer.

A lawyer and a good reading of the condo regulations. It's probably covered in the fine print somewhere, but it will most likely take a good lawyer to find out exactly who is responsible, if anyone.

Be prepared that your mother may indeed have to pay for the damage. It really depends on how the regulations are worded. Water damage is not always covered. Insurance policies don't cover flooding in many cases--water damage, especially flooding, is an issue unto itself and the typical rules of responsibility don't always apply.

Now, if someone could prove that the association had been negligent in fixing the cracked foundation, that might give your mother some leverage.

i would get a good lawyer!!

Here is a link that might be useful: basement drywall