You should have received a notice of intent to deny and request for evidence prior to denial. Without knowing whether this happened or not, and if not, why, and without reviewing the papers submitted it is impossible to answer your question. Set up a consultation to review the papers and discuss these issues.
Clearly you originally decided not to hire an attorney .... for whatever reason.
Now is the time for you to re-think that decision. You need professional assistance.
By the way, I hate to be the bearer of bad news ... she won't be able to visit 'country' (I assume you mean her home country) in November ... it will take longer than that to sort things out.
PROFESSOR OF IMMIGRATION LAW for over 10 years -- This blog posting is offered for informational purposes only. It does not constitute an attorney-client relationship.
Without reviewing all the correspondence you received and the denial decision from the USCIS, a proper legal response can not be given. There should be more than what you stated.
If you believe that the person who prepared your documents is not competent and as a result of this person's actions or inactions your mom's case was denied then you should look for another professional on your side, and by the way you do need professional help at this stage.
As to your wish to physically reconnect with your mom in the US within the next two to three months, unfortunately it won't work under the stated circumstances as these matters take much more than two or three months.