I do not know why you are not responding, but you are not charged per question, per response, nor per answer. So after I give you my answer, you can continue to ask me questions without additional charge until you are satisfied. I apologize if it is a site issue that you posted and the post did not go through.
If she overstayed more than 6 months but less than 1 year, it is a 3 year bar. If she overstayed 1 year or more, it is a 10 year bar. So if she is applying to immigrate through you before the 3 year or 10 year penalty has passed, she will need an I-601 waiver ) and to get this waiver she will have to prove that her spouse will suffer extreme hardship if she is not allowed back in to the U.S. These waivers are very difficult to get. The reason they are difficult to get is because your hardship probably will need to be more than just economic hardship or emotional separation hardship. So because they are difficult to get, no one wants to risk leaving the U.S. and getting stuck outside for 10 years if it isn't granted.
You can look at this link to get more information on I-601 waivers. It is from the U.S. Embassy in Syria, but it is a good description and the process should be similar in all U.S. Embassies.
and here is another link:
And here is a link to what extreme hardship is:
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