The customer is obligated on the loan. Even if the daughter has paid the payments for the last 60 months, the mother is responsible for the payment today if for any reason the daughter quits paying.
From the Commentary to 226.34
2. General prohibition. Section 226.34(a)(4) prohibits a creditor from extending credit subject to Sec. 226.32 to a consumer based on the value of the consumer's collateral without regard to the consumer's repayment ability as of consummation, including the consumer's current and reasonably expected income, employment, assets other than the collateral, current obligations, and property tax and insurance obligations. A creditor may base its determination of repayment ability on current or reasonably expected income from employment or other sources, on assets other than the collateral, or both.
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The opinions expressed are mine and they are not to be taken as legal advice.