In the states where I have some knowledge of this, a probate can be re-opened. This might occur because a new asset of the deceased becomes known and must be distributed. I don't know whether a probate can be re-opened because somebody was unhappy with their share -- I would imagine that they should have objected during the administration of the estate and had their claim adjudicated then.
If a final and distributive account has been filed and all of the heirs were notified of the filing then once that account is approved by the court the heirs can no longer object.
It sounds like what might be happening here is that the final account was filed a month ago and the other daughters are objecting to the account. If that is the case then the court will set it for hearing and determine whether the estate was distributed accoridng to the law and the will, if any.
You should speak with the attorney that handled the estate.