我可以向法院请求以痴呆症的不当行为撤销我妈妈的POA吗？

You can go to an Elder Law Attorney and explain what you have explained to us, taking with you what documentation you can get your hands on. You can ask to apply for guardianship of your mother, for whom you now care. The fact that you care for your mother will give you some standing. But, as I warn others, Hester, a family fight in court (your Mom gave POA to your sister and you care for your Mom) can, in some cases result in the guardianship going to NEITHER you or your sister, but rather given to the State so that an uninvolved paid fiduciary can assume guardianship of your mother. This could result in your Sister and yourself having no say at all in anything.
因此，最好是您和您的姐姐一起工作。过去，您已经来找我们这个问题了，我真的想不出另一种方法。祝您好运，并希望您在采取一些措施时会更新我们。
你也可以和你的妹妹说话。您确实有一个讨价还价的筹码，因为您目前是捐赠。您告诉姐姐，您将在一个月内离开州，她将负责所有涉及您妈妈的事情其他。祝你好运。

如果撤销了POA，那么您的妈妈将需要一名监护人。
可能是您或法院可以任命的。
要提出投诉，您可以联系处理原始文书工作并与律师讨论的律师。
或者，您可以向APS提出投诉“财务滥用”或可能“拒绝医疗保健”（如果她拒绝医疗服务），他们将开始调查。

您可以尝试，但是撤销姐姐的POA并不意味着您可以被分配。这必须由妈妈完成，她现在不胜任。

How do you know that she's secretly taking her to sign legal documents to get her assets? If you're getting the info from your mom -- with dementia -- you know that info may not be accurate, correct? I'd make certain you know this is going on for an absolute fact before spending any time or money on it. What if you called APS and it turns out none of it was true...do you think it might affect your ability to provide her care? Just recommending that you are positive this is going on before acting on it. In the meantime you can video your mom (with a time stamp) demonstrating her memory loss or lack of comprehension. When you "petition the courts" what you're really doing is going after guardianship for her by you. If the courts smell an ugly family brawl they might deny guardianship to anyone and give it to the county. Or, you sister may remain as PoA. Pursuing it through the courts is very expensive since you will need a lawyer. Please consider all the downsides.

我会考虑自己见律师！或与AP联系并告诉他们您的疑虑。