I would like to know how much inheritance (money in bank)

As the bank account is in his name alone and there is substantial money in there the Will has to be probated. It doesn't if there is very little money but that would usually mean a few thousand dollars only.

You cannot change the executor. Your uncle had the right to choose whom he wanted to administer his estate. If you find she is not adhering to the terms of the Will or committing fraud you can bring an application to the court to have her removed but courts rarely do that so you will need strong proof.

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Yes absolutely.

You have a right to know what steps she's taken..

If you are a residuary beneficiary (so you are sharing in what is remaining) then are entitled to all the details about the expenses. But if you are just getting a specific amount of money you are not.