Should i trust this friend who lies?

okay i made a friend at uni she is okay but she is very nosey and talks about other peoples lives and i feel that i cant trust her so i only tell her things within a limit! but i also know she is a big lier she is 25years old 4 years younger than me lol! and she lies about her love life she calls other people sad if they sound like they are lieing but she does it herself! she says she has a boyfriend but she has never shown a picture. and every time you ask a question its always a diff rent story (about her love life) its like she is hidding things. recently she lied about her exams saying she got this mark blah blah! and said she ped her coursework luckily i remembered her student no. (oops lol) and i saw that she had 8% for one of her exams and she lied to all the people who know me and her that she failed by 1%. she always talks about peoples lives.and always stares if u have a new hair style. she has at uni failed her degree but she is ling saying that she needs to do another exam to p. she is nice apart from all of this. but when it comes to being friends i do like her she is bubbley but when it comes to trust and talking she seems a little funny. i rem once i told her i am not coming to uni because i am ill. and the nest day all her friends where asking saying aww are you better now. i was like omg i was only ill for one day lol! also when i talk to other girls in the cl she winks eyes at them they don't like her but she does it to sound in fashion and says big lies to keep up in fashion! like my boyfriend big car etc.(i wonder if he exists or is just imaginary)