She sounds overtired. Over-tired babies/kids actually sleep worse, and wake more.
Is she teething or anything?
Is she feeding on demand? Before bed and naps as well?
How is her intake?
Do you have a routine pre-nap and pre-bed?
Sometimes if over-stimulated, babies also have a hard time sleeping.
Do you notice her sleepy/tired cues?
Pre-bed and pre-nap... are making things calm, quiet, dark.... allowing her to first wind-down... then segue into a nap and bedtime.
Really make a daily routine, always the same... pre-bed and pre-nap.
Where is she sleeping/napping? In a crib?
My son, up to 1 year old, was taking 3 naps.
From 2 years old he was taking 2 naps.
Now at 3 years old he is taking 1 nap.
This is everyday. I went by his cues. He does not fight it.
Bedtime, for both my kids, is 8:30 now.
When younger, bedtime was earlier.
Even with naps, my kids slept at night fine.
Something is tweaking your baby... is she perhaps hitting any milestones? Developmental changes? New motor skills? These things, also tweaks a baby's sleep.