Teething at 3 months?

F
Hi ladies, I noticed today that my three month old's bottom front gums are very white, like you can see the two teeth underneath the gum. Is she teething already? She's been drooling a lot the last couple weeks (I just thought that was coz she has started sucking her hands) and this past week she has been terrible with sleeping at night... What else are signs of teething? And how long can teething symptoms last before the teeth finally break through? Any tips? I've started rubbing bonjela on the gums and I tried giving her a teething ring, but I don't know how she's supposed to use that when she's too young to hold it lol.