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She doesn't have to get away with it though. You are correct in saying you relied on her. You were supposed to be able to do that. She is an expert and held herself out to be and you relied on her, to you detriment.
You can sue her in Small Claims Court and self-represent.She is required to put you in the position you would have been in had she not made this error.
I suggest making it clear to her now that you expect her to compensate you and will sue her if necessary.