You still haven't told us:
1. Why would she like to visit and for how long?
because we're having a wedding reception here, and she wants her mum to come attend it as she doesn't have any family members here
2. What documents did she submit?
we submitted all the bookings we made regarding the reception and we gave them a paper from her husband's company mentioning the salary he gets
3. Does she live with other dependent family members in Dubai (spouse, unmarried children, in-laws, etc)? Does she own property? Employed or not employed?
she lives with her husband and 2 girls one grade 9 who's coming with her mum and the other daughter is staying in Dubai
4. Has she traveled to visa-required countries (US, UK, Schengen, Australia, NZ, Japan, etc)?
no she hasn't
5. When did she apply?
the 1st time was in April and the 2nd application was in 18th of June, 2018
6. What is her immigration status in UAE?
she's a permanent residence in Dubai and she mentioned that in the application and attached a copy of the PR visa