How do I collect alimony if my ex moved to another state?

Do you know where she is living now? If so, you could retain an attorney in the county where she lives, have him or her register your dissolution judgment as a sister state judgment in that jurisdiction and then collect on the spousal support obligation by attaching her assets and/or income through the procedures of that court. If your original petition for dissolution of marriage even mentioned attorneys fees, you should be able to collect attorney fees for the collection process as well.