Try to let her steer the conversation. If she had a great time then tell her you're glad ....if she had a rough time... sympathize. Just validate her. I wouldn't get into the.... I missed you thing. Just be happy go lucky you.... upbeat and positive. Give her something to ponder. You can say how much you missed the kids in front of her tho....
Psa 51:10 Create in me a clean heart, O God, and renew a right spirit within me.