I am a newbie on this site but so far have felt most welcomed, but I do empathise with you, I have been in a similar situation and it is hurtful if, for whatever reason you feel out of the loop. Perhaps the new girl on the block was just trying to make herself out as the `joker` of the group because she is unsure where she fits into a well established group. However, if there was perchance any intentional disrespect towards you then I think you should take the wind out of her sails by being exceptionally nice towards her next time the group meets. This would put her immediately on the back foot and reinforce in the minds of the original group just what a nice person you are. Remember the old adage `Keep your friends close but keep your enemies even closer!` Hopefully though this will all shortly blow over and you will become genuine friends.
Things you find stressful that other people don't notice.
New house and a sloping garden