Thank you for your question
My name is ***** ***** I shall do my best to help you.
Your sister cannot do this.You should remind your sister that as Exacutor she has to carry out the terms of the Will - and that if she fails to do so she is personally liable to you and your other sibing for the loss - and you can sue her personally for it
I hope that this is of assistance - please ask if you need further details
Thank you - please accept my apologies for the typographical errors - one of my fingers is bandaged and it is very trying!