Is this being needy?? Advice greatly needed.?

Last Friday I texted a girl I haven't seen or texted in almost a year. She responded and we had a nice long conversation. I asked to meet up and we did on Monday. We had a great time and she was laughing most of the time and opening up about herself quite extensively. At the end of our rendezvous we agreed to make plans to see each other again. I didn't text her on Tuesday but I texted her Wednesday with an inside joke that was made during our rendezvous. She responded excitedly but didn't reply to the next text I sent a few minutes later, which was strange for her as she always replied to my texts even if she had to reply late. I let that go and tried again on Friday asking her for a favor my friend asked me to ask of her. She didn't reply at all.

I highly doubt that she is the type of girl that would straight up ignore me; she is extremely nice and I can't recall a single instance where I could have done something wrong. She also said that she wasn't going to be busy So I was thinking about messaging her on Skype today (she gave me her Skype name but I haven't added her yet) saying that I hate to be annoying, but I am just curious that everything is alright.

Is that too needy? I really enjoy spending time with her and I don't want to see this thing dissolve because I was being too needy. But I also don't want her to lose interest because of our lack of communication.

So should I do the Skype today? Or what is the best option?