A lot of this is very normal. Look at it this way, when you and your dh go to a party, do you talk to your friends, or do you spend all your time just sitting with your dh? Of course you love him best, but you see him more than you do the other people there, and you like to spend time with them, too, right? :-)
As far as why she says Daddy first - that also makes a lot of sense if you think about it. How many times a day do you say things like "when Daddy comes home, we're going to have dinner" or "Daddy should be home soon" or "Daddy is at work now".... Plus, the "Da" sound is a lot easier to make than the "Ma" sound (one just moves your tongue, sort of "bouncing" it off the roof of your mouth, the other requires you to use your lips more and takes more skill to make the sound).
I know it can be frustrating sometimes, but try not to let it get to you, this is normal :-)
at 10:32 PM on Mar. 6, 2011