Jen is trying to investigate a house full of living dolls. Three of the dolls are evil images of the people who have been murdered or died in some other way in that house, one doll is looking like herself.
Will she be able to solve the mystery? In this episode you can see how it goes, and find out some more on the people involved in the case.
I don't like to call her 'spider queen' because she has no genetic relation to spiders whatsoever... but yes, this is one of the important parts where Kelsey is explained, even introduced. Another one is of course "Kelsey - The Story" [link] which is more of a pictural superquick history on the character's past 100+ years.
The one who took her money was the lady who took Kelsey in when she was abandoned as a baby. She floated on the river and this ... old hag... found her. Didn't particularly take good care of her as you saw in the pictorial and other comic pages later on, but at least she had some food and a roof above her head...