Keep in mind that Gilda is a Griffon and what I said about them . That and other factors likely limit the time she can stay in Ponyville. So she likely plans to spend some quality time with Rainbow Dash, who she has not seen for a long time. Not exactly a situation where you want someone like Pinkie Pie interfere.
Depending on how well the writers did their research, she might aswell have come for a specific reason, but I think that would probably cause soccer moms to complain. I'm just saying that the power of love is a curious thing!