hi, welcome to the boards!
how old is your baby? i'm guessing under a month???
it does sound like she's switched nights & days. here are some ideas that helped me - keep in mind that all babies are different. my first figured this out in a week or 2; my second took a LOT longer.
* Daytime Mommy was very chatty, interactive, exposed babies to sunlight (either outside or through a window when it's cold). lots of snuggling, kissing, and those sorts of things
* Daytime Mommy would do her darndest to wake them for a feed by the 3-hour mark. my highest points of desperation involved a naked baby & a damp washcloth!
* Nighttime Mommy didn't talk, turn on lights (no more than a nightlight), no eye contact, and kept things very low key.
the idea is to help cue her as to when to sleep, and when to not sleep as much.
sounds like you're having luck with shh/pat too, which is good.
anyhow, HTH