Baby gave up on sleep

So my baby is 6 1/2 months old and she has been having horrible sleep . She’s been tossing and turning , waking up as soon as i put her down, wakes up every hour, feeds , then goes back to sleep and when i try to lay her down again wakes again. Running on like no sleep 😭. These past two months has been rough when it comes to sleeping , before that she used to sleep for 10+ hrs at night . Even a couple weeks ago she’d sleep for 4-5 hrs then wake up but this week hasn’t been longer than an hour and she seems so tired because of it and i know i am. Any advice ? Anybody know why this could be ? I have the wonder weeks app and doesn’t look like she’s going thru any leaps