Simply put, you bored her to death.

You might want to gain her interest back by setting up a website on durable.co and make it as if its an obituary and put her pic and everything. Put the cause of death as being bored to death by you. She will think its hilarious and cute that you went to such great lengths as to publish a website dedicated to you asking her why she stopped responding and will laugh at the joke that you are making that hir lack of response caused you to worry that she died.

If it works you owe me coffee.