im trying 2 space myself from one friend and make a new one but its kinda hard?

ok the friend im trying 2 space myself from is rreally realy deprest and is just like a happyness sucker like a black hole or somthing everytime im around her even if were having fun i just feel like iv been totaly drained. i really love her tho and i dont want to hurt her. all im trying to do is have this other girl i meet over to u know hang out make chrismas cookies and mby go to the moveis or somthing. problem is the deprest one knows her to and if she finds out that shes coming over then she will right away be like can i come over too. now that wouldent be an issue but this new girl dosent know that the one im trying 2 space myself from in in fact depressed. and i know thats realy really confuzing but if you understood that i would love advice on how i could get this new girl over to have fun without geting the fun sucker with it