I'd just neg a bit...ask something like ''Looking rid of me already.. do you not like me?'' (jokingly of course and with a smile), if she says ''no'' like I'd presume she would I'd just laugh, smile and say to her friends ''It's alright, you guys like me, I'll just take over (her name)'s place.. we'll be a much better trio''... if her friends work in your favour then she's having to think of something (you have put her out of the group in a playful way and she should try and work to get her position back), but whatever she/they say back (as they could stick up for their friend here) you just have to be on the ball and quick-witted about it. Like if they were to disagree and say ''no she's much better'' you could say ''Yeah but she's looking rid of me..clearly intimidated by my total awesomeness.. so she must just be averagely awesome...''. You're still saying she's awesome, but just not as awesome as you so she can't take offence, and if she does just say that to her lol. If you do this is a fun way and they dig it, it can be great! If not, they can't take a joke so don't worry about it, there not fun lol.
If they all team up on you I'd just ask ''what is it about me you's don't like then?'' (still smiling and having fun with it)..just to get something to work with, and go from there. Turn whatever they say into a joke! Then when you're on a roll just say ''right enough though I should get back to my friends, good chattin blah blah blah'' and that's you done.
I know some of that can seem a bit dodgy (like trying to take over the friends place in the group) but if everyone is having fun and the convo has been jokey and all so far all should be good...works for me anyway lol