Would leaving a 19 month old for a long weekend cause harm?

A very good friend of mine is getting married in Vegas in April. My daughter will be 19 months old at that time. I've always tried to follow my instincts with her because I figure that as a mammal my instincts will steer me in the direction that is right for my daughter as a human. For example, I don't try fad methods of rearing children such as allowing them to cry it out if it goes against my instincts.

Everyone has told me that a few nights away will not do her any harm, but I know that mammal babies naturally stay close to their mothers sometimes for many years (apes). I feel dread at the thought of leaving her. I worry that it might weaken our bond or that she will feel abandoned and that it could cause her psychological harm. I don't know whether this is just the first time mother in me afraid to let go, or if these are my instinctive feelings that I should listen to. Of course I really want to go, so for the first time I feel confused about what is best for my daughter (as a human mammal who needs her mum).

Does anyone have any info or opinions about this? Links would be great to if you know of any articles.

She would be staying with her grandparents who she sees on a regular basis.