Not very professional of her, for sure. Sometimes both hosts and guests have things going on in their lives that we have no idea of, that make it hard for them to respond in timely fashion. She obviously knows you are coming. I'd just show up at the arranged check-in time and hopefully all will be fine.
You can also contact airbnb to tell them that the host is not responding to your messages and that when you phoned her, she brushed you off. They will then usually attempt to contact the host on your behalf, so I hear.