To go or not to go to the party? The cohost is sick

I have a friend who is cohosting a Halloween party for other mom friends and their kids.

Well this friend of mine is sick and I believe still planning on cohosting the party. I have only met the other cohost once.

Normally I try to stay away from sick people, especially because I have a two year old that would be there with me.

But I feel bad about not going just because my sick friend will be there. Plus, what on earth would I say to her about why we’re not going when I already RSVP’d? Or should I just go?