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You may want to make sure to not check the "remember payment method" button or else you might accidentally (or not o accidentally) purchase a bunch of stuff on her credit card, and she will get angry.
To answer your question: If you're not an authorized user of the card, then it is against the terms of use.
As long as your mother puts in the information, or she permits you to use it, there will be no issues involved with the transaction.
Great, a few days ago my mother used her credit card (or paypal account, i don't remember) into my accountto buy me a game, but the transaction has not been completed because we had no money, I hope valve doesn't suspend me.
My mother has no problem using her cc for me, i'm afraid only because VALVE could suspend me for using a cc into my account that it's not mine.
That's fine as long as she doesn't issue a charge-back from a steam purchase, only then valve could suspend the account.