Weddingbee boards

We are trying to get some advice on how to handle invitation wording, seating, etc.  My husband and I have been married 7+ years and he was given custody of his 3 children right after we married.  So, I have been the primary "mom" in their lives since then due to issues their bio mother has had (no visitation, supervised visitation, jail time, etc.).  Our daughter is getting married at the end of 2012 and she and I are planning the wedding together (she is involving her mother as little as possible) and I am the "mom" who went to the dress appointment and helped her pick out her gown.  Bio mother is not contributing financially to the wedding, not one penny. 

While we are in no way suggesting that our daughter's bio mother be excluded from the wedding (even though none of us get along), is it appropriate to leave her name off of the invitations?  I suggested to our daughter that all 3 of us sit on the front row with our respective children between us so her bio mother would not get mad.  The sad fact is that our daughter has already acknowledged that her bio mother will make things difficult and make demands b/c she is her mother, even though they are not all that close. 

Suggestions on how to handle bio mother during the planning and at the wedding?

@Moja Milosc:    We have told our daughter that we will do whatever it takes to make her wedding day and the planning process as wonderful as possible but she started and crying and told us that the promise was only coming from us.  That just breaks my heart for her but infuriates me at th same time.  We have also told her that she has to decide what she wants and let everyone know and that we will go along with her decisions.  Here is the thing, our daughter is young...18 (NO, she isn't pregnant) and tends to be a people pleaser so I don't know how honest and firm she will be on stuff.  Honestly, she looks to me for guidance on alot of issues and especially on the wedding planning and she even tells people that I am her mom.  We just don't think it's right for her bio mother's name to be anywhere when she never contributes to her life (and I am not just talking financially).

Thanks.  We have to figure out a way to ask our daughter point blank how she wants to handle the invitations b/c she has already told her bio mother that she doesn't get to make any decisions or be too involved since she isn't paying anything.

You just have to know the situation to get a true understanding, but I won't post that for the world to see.  Believe me when I say this, though....bio mother will make everyone, including our daughter, miserable if she feels slighted in any way.