Issue #1 - You have done nothing wrong. You are taking care of her needs, which sometimes means she will get upset with you. If you are her main caregiver it means you are the one who does the most disciplining. It's normal for little kids to prefer the company of someone who doesn't impose rules. Have your mom start doing things more your way. If your daughter needs a diaper change, it needs to happen immediately, regardless of whether or not your daughter wants it. Sitting in a dirty diaper can cause diaper rashes.Issue #2 - Your daughter has startd blowing kisses to you because that's what you do to her when she's with her father. If she's sitting with him, let them have their time together. It's important for her to bond with him one on one, without interruption from you. Don't worry about your relationship with your daughter. I'm sure you two have bonded well. My kids go through phases where they only want one parent and not the other. It's been most noticeable with my daughter. One day she'll love me and then will only want Daddy for a week or two. And then she'll switch and wants nothing to do with him. It may be a little sad, but it's completely normal.