When she said "we" do you think she really meant she would get to trace her own or was it an offer to help you as she did offer her space and equipment? You are the only one who can really know this since you know her personality and her facial expressions and tone.
If you really believe that she means to share the pattern maybe you can say "yes it was X amoutn of dollars - are we splitting it equially or is there some offsent for me using your table?"....
I don't have a problem sharing this stuff - yes I know all about copy right laws but I'm generally not selling my stuff - I'm spending my money and giving it all away....
Sticky situation - sorry your there!