WoW your New Baby is so Adorable.. I would say she is MainCoon for sure.. Well keep the new baby in a seperate room for a day or so & then just gently start intro her with the others.. Just take your time & be patient with all.. They will all hiss & ect.. But I have more than one female && they all get along great.. Now they all have their days & moments - but in all everyone gets along & is happy.. Good Luck & I just know all will be fine..