L.Z.
When she gets up, do you play with her? You might have more success leaving the lights out and keeping it quiet, and if your husband or partner is available to help, enlist him to do some quiet walking and rocking as well. Babies usually do this when they're having a major developmental spurt and want to practice new skills. It's tough, but it doesn't last forever, I promise.
I don't believe in letting her scream, either. That's trying to break her will and will only make it worse. Just keep the lights low and remind her that it's still nighttime for sleeping. She's old enough to start understanding that, although obviously she still is too little to send to her room. Try to wear her out during the day, and as bedtime approaches switch to quiet activities like reading and a warm bath. Good luck!