How does the Medicaid Lookback period treat reimbursements?

For the past 5 years I have purchased groceries, personal items, furniture, etc. for my house-bound 90-year-old mother from my checking account then, she has reimbursed me from her checking account. I did not keep receipts as we never thought she would survive long enough to need long term care or medicaid. I am now applying urgently for Medicaid because she had to go into long term care and don't know if they will penalize her for the reimbursements. My checking account would match most of the reimbursements other than $2K she gave me for caring for her all of these years so she could stay independant. Any advice before I submit the Medicaid application?