You may well have a cause of action, under the facts you describe. Her moving from the house is not necessarily an issue, because she would have the right to rent it. The fact that she is failing to maintain it and pay the current expenses is a real problem, however. It sounds like her actions would constitute "waste," which would be a reason to set aside the life estate. You should consult with a lawyer to discuss the situation in more detail and to determine how best to proceed.
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As my colleague stated, the issue is not whether she vacates the property but that she is allowing it to waste away by not maintaining it. You should seek the advice of an experienced real estate litigation attorney in your area at once. You have rights that should be enforced.
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You should consult with an attorney. If you had an attorney during the probate proceeding, he or she should be able to assist you. Not paying the taxes and maintaining the home constitutes waste. A life tenant is responsible for the taxes and maintaining the home.