What would you do?

Ladies, Need advice/opinions....

So we planned a weekend away to Big Bear with our best friends who are another couple with a 2 and 4 year old for this weekend. We booked it at Christmas time and baby girl is 4 months now... Monday both our friends kids got a bad cold and cough where the mom thought possibly croup. She said she called the doctor and they stated that because they have no fevers and are acting fine it just has to run it’s course... so they aren’t on antibiotics so I assume they ruled out croup because of no fevers but she said they sounded like seals... also as of yesterday the mom has what she believes is a sinus infection... the trip is paid and non-refundable and I got all the groceries today before hearing this news (I texted her cuz I saw it on her Instagram stories)... not to mention she’s gluten free so I got everything to accommodate her... what would you do? Do you think since we don’t see them until Friday afternoon that by then they shouldn’t be contagious? How can I keep baby from getting sick? We can take vitamins and such to prevent but not her... she’s formula fed and her dr said she looked great yesterday at her 4 month appointment. I just don’t want any of us sick but I don’t want to tell them they can’t go anymore and my hubby paid for it all... they still plan to go and are hoping to feel better and we have all been so excited for it.... I’m probably overthinking it but I just know what we went thru with her first cold and if I can prevent cooties I would like to! Thanks!