We are feeling hurt and lied to by our daughter’s birth family. What do we do?

My husband and I are adoptive parent of a 2 yr/old girl since birth. (Nancy) The birthmother told us the birthfather was a one nightstand and didn’t know anything about him. We agreed to send pics and that if she felt like she wanted to see our daughter later on, that we could meet. When Nancy was 9mo/old we met with the birthmom and her parents. She told me “I have to be honest with you, I’m pretty sure the birthfather is this guy (Will) and he’s the love of my life”. Stunned after that surprised, there were other surprises. Next, she said the birthfather wanted to meet Nancy. Then they emailed us asking for a DNA test, that they would pay for, b/c they thought “it would be in Nancy’s best interest for us to know for medical reasons”. We ignored that request. Then there was an unexpected visit to our house by the birthmother and her mother. The last time we met the birthmother and her mother came , the supposed birthfather –his mother, sister and nephew. Noone asked or told us that they were all coming. Lastly, the birthmother has asked us to meet her sister and her niece’s 1st birthday. We are completely overwhelmed by the events that have taken place and know we obviously need to set limits, but we feel we have been lied to and taken so off guard that we are wanted to go back to sending pictures occassionally and letting Nancy decide when she is at a more mature age if she wants anything to do with her birth family. We know some feelings may be hurt, however we only agreed to send pics and to let the birthmother see her. We never said for how long and never agreed to all of the others that are now involved. We maybe have been more comfortable with everything if we had not been lied to and caught off guard with all the other events. We just want to protect our daughter from lies and feel like she should have a say. Any comments or advice would be greatly appreciated.