Me and my friend RAN AWAY FROM SCHOOL!!!!!!!!!!!!!!!!!!!!!!!?

Me and my friend was going to run away.. so we ran out of school (sneekily) and ran somewhere ANYWERE! then we thougght omg what hae we done this for? were soo stupid! anyway.. then my friend said "Katy please dont leave me,, I want to be with you all the time.. yoru the only one who actualy cares for me and who is there for me.. my mum or dad hit me and trreat me like crapp! i want to stay with you always.." i was going to go back home becuase i decided that running away is just going to get me into much more trouble so she then said all that <<<< But in the end she said "Okay i will go home i wil see you on monday at school i suppose.." So we both went home .. but before this she was crying saying "I carnt leave you please! i want to livw with you" But i did nt know what to do??! omg.. she sais he wishes she had a family and a mum and dad who would love her and let her do things.. i dont even have a family in adopted... and my dad is dead my mum is VERY SICK and my brother is having problems (you know.. drinking alcahol and smoking e.c.t) soo inm in fostercare.. but im alright i suppose ive learned to stay strong and to just take it alll life throws at me.. but im feeling sorry for my friend.. it actaly got the the point where we both was going to run away ANYWHERE but then I REALISED mmmmm this is BAD. but she stil wanted to do it! now we both r home and i hate the feeling that she hates her family and wants to go to adoption as well.. should i do anything? do i ring social services? erm. anything else? were both girls and 13 thanks