Why my own friends kept lies to me...?

few days ago, one of my best friends - she came to my father's birthday that my father want have her to come because he knew her since we're childhood for 24 years. now I didn't know that she lied many ways --- She told me that she couldn't stay as long .. will be only 2 hours then she have to go to her sister's house to have planning.. so I just not really complain and very understanding. Yeah sometime she tend always last minute to leave. So She asked one of my such good friend for a ride to drop her off. SOOOOOOO, after my such good friend did text message me and told me that my best friend was dropped off at my sister's house for party ... because of drinking she want. Now I feel confused and don't know why she lied to me that She supposed gone with her own sister in other city.. now She lied to me about that. She decided ditch off my father's party because she said Our party is boring.. I told her that it isn't my party. I pay some respect for my father's important 60th birthday more formal party have some wine and chill ... We have family who really want to nice party not like WILD party. so She kept complained say NO BEER?!!.. Honestly I have no idea why she complain about drinking.. well I prefer have party more sober but it's okay for my father want drink some wine for mellow and quiet to enjoy some games... WELL.. what are you guys think about that??? sooo I just not complain that She lied to me but why She prefer my last baby sister is more fun party and drinks.. my sister is only 20, and my bff is older than her likes she's 24. She have a child recently gave born last couple 2 months ago. She kept complain want have PARTY when she bring her own baby at all younger people in party even they smoking pots and drinks front all kids... well it's all so What do you think that if she kept lies to me and it would worth to have her in my life continue???