If that is a lump, yes, it very likely is infected. Though if there appears to be black or purple discoloration around the incision, there could be bleeding. If you think there could be internal bleeding and/or her condition deteriorates, if your vet has an emergency number I would call it or find an emergency vet that treats rabbits.
If it only appears to be infected and she is taking the critical care feeds(which I would continue with every 4 hours) and doing alright otherwise, hopefully she'll be ok til morning when you can talk to your vet. They will likely need to do another surgery to lance and drain the abscess, then put your bun on rabbit safe antibiotics.
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