This is normal.
She is young. Just a Toddler.
My kids at that age... well my son wasn't even potty trained yet.
My daughter, I would keep her company and help her.
No biggie.
One day they will be telling you to go away.
Remember that: at this age, their fine-motor skills & gross motor skills are not fully developed yet, nor accurate.
And they are, messy.
Normal.
Kids this age, can't even write well, yet.
They can't even dribble a ball, yet.
They can't even dress themselves well yet.
For example.
I dunno.
With my kids I helped them, when they were still so young.
And going into a bathroom by themselves, can be scary. At this age as well, they start to have general "fears" developmentally. About anything or about the dark etc.
One important thing though:
Make sure, you teach her to wipe from front to back.
Little girls, need to learn this, and to do it well. Which can take time.
They need to learn, so that they don't get, bladder infections.