I want to help him but not her

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My friend Dave is getting married in June and the place he was going to have his reception has now cancelled on him so he needs to find somewhere else but doesn't have a very big budget. I really want to help him out but I don't want to help his fiancee Helen. I was quite good friends with her until just over a month ago when she attacked me on facebook saying I wasn't a very good friend to her when I had been and I got loads of messages from people saying her was in the wrong and I had always been a great friend to them. Even Dave doesn't agree with her. Now, I've found a few places that they might be interested in but I don't want to help her which I will be doing if I pass over the information. I don't want her to see it as me trying to be friends with her again because I don't. How do I help them without her thinking I want to be friends again?