The executor would have to give you AT LEAST a 15 day written notice to vacate the premises. Anything less (such as "immediately") is not going to be enforceable, and could even constitute a "wrongful eviction" should she try to actually kick you out. She has to give you 15 days written notice, and until you have a written notice that actually says that you have 15 days to leave, you wouldn't have any obligation to leave even if you didn't have any ownership rights.
That being said, you do have ownership rights to the house, if nothing more than because you're a beneficiary of the estate. But you also purchased the house, so you can compel the executor to sign it over to you. It's abundantly clear that the executor is acting in bad faith here. You can hire a lawyer, file paperwork to have the executor removed from this position, and have either yourself or someone else appointed in this role. If the court determines that there was bad faith, the court can hold her responsible for any costs associated for removing her (attorney fees, interest, etc...) as well as sanctions. It also seems like fraud, selling you property and then reneging (but keeping your money).
That being said, you need to contact an attorney in your area that deals with probate cases. Go to www.lawyers.com or www.legalmatch.com to find an attorney in your area. You should be able to find one that will give you a free initial consultation and better advise you of your rights, any problems with your case, likelihood of success, how courts are treating cases such as yours in your area, and what you should do next.
Now you can certainly threaten her with this, saying that if she tries, you will take her to court for wrongful eviction, bad faith, breach of fiduciary duties, contempt (if she didn't sell the house like the court told her to) and fraud. Maybe she'll think twice. But if she continues to pursue eviction, get a lawyer and sue the you-know-what out of her.
Hope that clears things up a bit. If you have any other questions, please let me know. If not, and you have not yet, please rate my answer AND press the "submit" button, if applicable.
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Thank you, ***** ***** luck to you!