No. RRSP deduction limits are not transferable, so you cannot make any contribution or claim any deduction based on your spouse's RRSP deduction limit.
If you have received any official contribution receipts, you may claim these as a deduction at line 208 of your return up to your RRSP deduction limit.
As long as your mother's RRSP deduction limit is equal to or greater than the undeducted contributions, she can deduct unclaimed contributions on her return.
If she wants to deduct the unclaimed contributions on a return for a previous year, she can request a change using My Account, based on the allowable deduction limit for the applicable year(s). She can also call 1-800-959-8281 or write to request changes.