Monarch Chrysallis Formed Today

We have a very large old jar with twigs, a vase filled with milkweed and until quite recently a hungry monarch caterpillar.  My daughter and I have been feeding her for a week now.  Yesterday we discovered that she had put out sticky gossamer threads upon the side of the jar instead of on one of the leaves or twigs we had for her.  Today she turned into a cocoon.  We missed witnessing the actual changing.  I am trying to trust the process, but am a bit concerned for her being perched against the glass.  I hope she can shift and change in there without the glass being an impediment.  I am wondering if anyone else has had this happen?

I read that it takes 10 to 12 days for the butterfly to emerge once the cocoon is formed.  I will definitely post back when she emerges.