Thank you for taking the time to post today, rachelfork57.
We're unable to create a customer ledger report in QuickBooks Online. What is available is General Ledger, covering everything in your QBO company. That being said, you can try looking for a third-party app that can extract customer transactions in QBO to generate a customer ledger report.
You may want to check out the customer-related reports by going to Reports and then Sales and customers section.
If you have other questions about generating customer reports in QBO, please let me know.