So just for the sake of clarification, this is the feedback box:
http://www.ci.minneapolis.mn.us/ward9/contact-ward9
As NineSpine said, the only required boxes are e-mail and name, so you don't need to put a phone number in. But to me, the key sentence is:
(Emphasis mine).
This doesn't say "all information here is public", it says "certain information". For one thing, a clarification on that would be ideal, but if I understand the data practices act, that shouldn't include personal information. It's hard to tell without a more in-depth privacy policy like most feedback forms have.
But with all that said, the main points to me are:
a: she published the e-mails on her personal twitter without censoring any private information. I basically always consider this a terrible thing to do, unless the person is either already a public figure or they've consented to having the private information released.
b: None of the messages she published were that inflammatory. They were basically "hey, I don't think you should be violating that judge's order".
c: Seriously, Minnesota, make a privacy policy on your forms.