Venting and needing advice

I have a 'friend' who I've really tried to help since she's been going through a rough time. A few weeks ago I was meant to look after her baby so she could go to a wedding (I look after him once or twice a week while she earns), the day before I was due to have him she text to say he's not well. She had him checked out and he was highly contagious, I told her I couldn't watch him as I have my own baby. I felt awful but I couldn't have my own child ill, we text/called every few days and everything was fine until I found out she was still putting her baby and others at risk by taking him out and letting him near others, I was nice and tried to explain why it wasn't a good idea and I don't know if I upset her. 2 weeks ago she was meant to help me out with work, my child had a cold and an infection and her son still wasn't 100%, I told her I wasn't sure what to do as I didn't want it passed between them especially since their immune systems were already fighting. I called her the night before as I had thought of a way, she didn't answer. I know she was relying on the money I was going to pay her, and I do feel bad knowing her situation and how badly she needed those funds. She was meant to come over today (both babies are fine now) and I didn't hear anything so I text and she made up some lame excuse, I have her and her son's Xmas presents here and I don't know if I should just drop them off and leave or ask if there's a problem. She usually is upfront if there's an issue but I don't know what to do. What would you do?