If the attorney represented the executor, he or she cannot represent you against the executor. Yes that would be a conflict of interest.
The attorney would not be able to represent you and the executor at the same time. That would be a conflict of interest. Of course, if it has been this long, you may be able to petition the court to act, on your own. In that case, you could certainly ask this lawyer to represent you.
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As a general rule, it's up to the attorney, when asked to represent someone, to decide if there is a conflict. If the attorney does not believe there is a conflict, it would be up to the daughters to come forward and object to the attorney's representation. It's important to keep in mind, that in many cases, the role of attorney for the estate is neutral. So there is no clear cut answer here.
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