QuickBooks Online won't create real donor statements.

When you're ready do to that, one way is to use our BRC Donor Statements - QB Online, which uses a collection of reports send from QB Online to Excel to collect and reformat the donation data into proper donor statements. It will include donations entered in various ways, including those entered as sales receipts and deposits. 

The tool includes a free trial, so you can try before you buy. No strings attached.