one the one hand, this isn't a problem but on the other it may create a problem.
The IRS publication states: (page 19 on the left)
https://www.irs.gov/pub/irs-pdf/p526.pdf
You can't deduct a cash contribution, regardless of the amount, unless you keep one of the following.
1. A bank record that shows the name of the qualified organization, the date of the contribution, and the amount of the contribution. Bank records may include:
a. A canceled check.
b. A bank or credit union statement.
c. A credit card statement.
d. An electronic fund transfer receipt.
e. A scanned image of both sides of a canceled check obtained from a bank or credit union website.
2. A receipt (or a letter or other written communication such as an email) from the qualified organization showing the name of the organization, the date of the contribution, and the amount of the contribution
So, you do satisfy #1 since you have credit card receipts. Since the rule is satisfy "one", you technically do not need a receipt from the qualifiied organization showing YOUR contribution.
However, your girlfriend might run into a different issue, depending on how much she is giving you to donate. You do not state how much your girlfriend is giving you, but if it exceeds $17,000 in 2023, she has a gift tax reporting requirement as it sounds like she is gifting this money to you and then you turn around and donate it. If her gifts to you exceed $17,000, there is no tax to pay , but there is a reporting requirement to the IRS. In 2022, I think the reporting requirement kicked in at $16,000.
