Hi M.,
Your child may be going through a separation phase. This is not unusual and really nothing to worry about. She will absolutely grow out of it, you just have to give her time.
The way I handle this with my daycare children is this: I sit on the floor with toys and distraction things in front of us. I sit the baby on my leg and begin picking up toys and talking about them while every once in awhile shifting the baby from leg to leg. Eventually I sit the baby on the floor, with the baby's back against me and my arm firmly around the baby. Do that for a few minutes. Then I begin to release my arm, the entire time talking to them. I distract them and begin to move backward, an inch or two at a time. I continue to do this until I am completely not touching them though my legs are still bordering them in. Eventually they will crawl away, or I can just slide backwards and get up. This whole process can take between 5 - 10 minutes. I know this sounds tedious but in essence, they have to learn to be away from you. There may be crying, that's okay. But evenually your baby will learn that it's okay to be away from you. It certainly helps when they start to crawl and they can get to some really interesting stuff! You should only have to do this for a short time, maybe a week or two, maybe once or twice a day. She just needs to know that when she is really fretting, that you are there. Just don't let this become a habit as you won't always have 5 - 10 minutes to do this whole process.
On a different note. It's okay to let your child cry. Put her in her crib and take your shower. She will be fine.
Good luck and let us know how everything is going!
C.