Please don't take offence but if she's a design consultant and you charged $50 she probably charged $150, 6 months of grace is done bump your prices up and make sure she knows that you do the creative stuff so you deserve a bigger slice of the profits. For an email design look at $100-$200 but if you are planning to do work like this in the future make sure you have an hourly rate otherwise you will come unstuck before long.
I have known people that have done a logo design for $200 flat fee and spent nearly 50 hours on it with revision after revision, that worked out to like $4 an hour which isn't worth the effort.
Best of luck
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