can the representative of the estate which is also 50% beneficary fire the probate lawyer and finish probate herself? it is and INformal probate

the lawyer involved is dragging out the probate to obtain more fees, she suggest leaving it in probate and saying the real estate contract will still be owed 6% just for change of name of deed once estate is settled..the contract was forced upon my elderly Mother who is the represenative and co-benificary of estate .the other 50% beneficiary didn't sign the contract so should be void..My mother wishes to pay off claims and close estate and keep the property as does the other half of designated beneficiary. the lawyer seems to be tripping my mother up.