I remember this movie from when I was a kid so here's the bits and pieces. There was a teenage girl who went through a mirror, and she was in a cage at one point and there was a witch. I believe the girl had blonde hair and was wearing a white nightgown. I just watched labrynth so I'm positive that wasn't it. Please help I've been trying to figure this out for so long!

Possibly 'Magic in the Mirror', was it animated or not?

It was not animated. The other night I watched the Hugga Bunch and I'm pretty sure that was the plot but
I just don't remember it being about hugging lol.

'The Watcher in the Woods' maybe? It's early 80's though, not animated. There was a girl that was trapped somehow from like 20 yrs earlier, but I can't remember if it was a mirror, but some kind of glass. Bette Davis (may have seemed like a witch, but was the missing girls mother) Good movie! Haven't seen it in a long time, but as a kid, I remember being scared of it!