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I am sorry to hear you are worried about Meeko. My name is Rebecca. I am a veterinarian and will do my best to help.
If the tooth is loose, it will fall out on its own, but it may take a few days, even a few weeks. Since it has always been longer than the opposite tooth, it probably has been coming out all this time, and now the attachments are really broken down so the tooth is now loose. This is probably bothersome to downright painful for her. It would be best to have it removed, but if she is eating, you can wait for it to fall out on its own.
Let me know if this is helpful and what else I can help with or answer.