I am using QBO Plus Only (No QBOA)

Our accountant had recorded a cash advance as a petty cash payment, let's say $100. She then reconciled the account with an incorrect ending balance. The cash advance PLUS the expenses purchased with the cash advance. So the ending balance showed $100 short Petty Cash. She reconciled anyway hoping to find the mistake & correct I guess.
That was in June, and now June through December are ALL reconciled, but with a cash amount balance reconciled in QBO that is actually short by <$100>. The ending balance for June should $100 more than it was.

How do I fix?