No this is not a basis for denial and USCIS should remedy that.

Wait for interview to provide medical unless RFE is issued.

You should wait until the I131 approval has been issued before departing as the case may be considered abandoned and denied.

Your question is confusing re: number of applicants. Assets may be used but an analysis should be done.

There are many reputable services that can translate and that USCIS will accept.

It means the case will be sent to embassy to await interview.

No this will not interfere with filing the affidavit of support.

She appears eligible to file for citizenship at this time.

Her visit must be for tourist/visit purposes only, not with intention to apply for GC.

Did she already have an approved case as basis for I824?