No, it doesn't count as a co-writer... however, you don't need to be making proofreading changes while you're still writing. that's for AFTER April! It's all about quantity. NOT quality.
Time spent editing is time spent not writing. ;)
Tell your proofer to get back to you... in May. :) they're welcome to tell you how awesome it is... but save changes for the finished product. Proofing and editing before the piece is done is like renovating a house before you're done building it!
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