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Since she has a signed agreement it would be hard to overcome it. In Texas, you can invalidate a contract if you can prove fraud or that you were under some sort of duress. Saying I did not read it is not a defense unfortunately.
the only other possible argument would be that she changed the terms of your oral agreement. It isn't a strong argument but a nice judge might consider it.
You need to decide if this is something you want to pursue in court and weight that cost vs the 2 extra weeks of pay on this and then ensure the next contract is exactly as you guys agreed. The other option is to just pressure her to modify the contract to reflect what you guys had orally agreed to and just amend it.