You did not say how long she has been appointed independent executor, which affects your options. Depending on time frame, accounting can be requested under Section 149A of the Texas probate Code or an accounting and distribution under Section 149B, which are 15 months and two years, respectively, from the date of her appointment. Depending on the facts, a breach of fiduciary suit could be brought sooner than that, but you will need to consult with a probate specialist.
You do have options, but you'll need an attorney. You're probably going to have to go to court over this. The sooner you act, the better. Contact a probate attorney in your area immediately so your interest in the estate can be protected.
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Attorney Shutt is correct. The executrix has already told you that this is going to need to be proven in court. You will need a good probate litigation attorney to assist you with this. You should not delay, because doing so could effect your right to object to what has already taken place.
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The fact that there is an executrix and an inventory indicates that this is in probate court. There are steps you can take if you act within time deadlines, but one of our probate litigation attorneys would have to assist you with this. It is not something you can do yourself.