If you accepted a bid but it has not yet taken place it is possible to “unaccept”, which puts the RB back on display the same as before you accepted it, so you can see all the bids you were choosing from before (obviously you don’t see any bids you may have deleted). On your reverse bookings screen you should see 2 tabs, pending and accepted. It should be in the accepted tab with an unaccept button.
If you do this, it doesn’t not affect the booking request you sent when you accepted the bid, so that girl will still have a booking request from you. However, she will also be able to see that the RB is back in the listings again.
However, if you have deleted an RB or if it has gone past the time specified, you can’t recover it, I don’t think.