How do I get the fields of form attached with a content type as token?
If I understand your question correctly you want send email after state field changes by Rule:

You should:


Create a new rule that will react to the After updating existing content event
Use the following condition:
Data comparison: node:field-your-field(maybe field-state) and node-unchanged:field-your-field
Select Negate: FALSE
Create the action
Send the email