BELLES exited the FA Women's Cup at the quarter final stage after succumbing to a more clinical Chelsea outfit.
John Buckley's side matched the Blues in terms of endeavour but two goals in the final quarter ended Doncaster's hopes of a cup run.
Gemma Bonner bundled home Sophie Ingle's 73rd minute corner at the back post to break the deadlock.
Dunia Susi then headed home Danni Buet's corner to seal the Londoner's place in the last four.
Julie-Ann Russell went closest for the Belles during the hosts' best period of pressure - ironically just moments before Bonner's opener.
Russell latched onto Aine O'Gorman's through ball but fired her shot just over the bar.
Belles were indebted to goalkeeper Mary Earps for keeping the scoreline blank before the break, denying Susi from point blank range with a fantastic block.
Earps could only watch as Susi then blazed over the bar from two yards out with the final kick of the first half, while Buet had earlier struck the bar for the visitors following an Earps punch clear.
The home side worked hard, and Russell looked a threat on the wing, but Buckley watched his side draw a blank in front of goal for the second successive week.
Belles could take heart, nevertheless, from another spirited performance and a major victory off the pitch as a crowd of 538 watched at the Keepmoat Stadium.