@Jens79 thanks for your reply
I applied for 90 days stay but when I calculated bank statement money is only for 30 days but I write a letter in letter I mentioned that I am going to cover all expenses of my mother during stay but I didn't registered that letter from commune
And for 2nd I attached power of attorney document with file that she own a property in pakistan she widow and retired so she don't have a have anh salary slips only thing I added was bank statement .but I missed pension slips didn't added you think that's reasons for 2nd
-@Abed87
If I understand you correctly, you applied for a stay of 90 days (the maximum possible), but only submitted proof of funds for 30 days (possibly the actual length of her stay). If so, that’s definitely a problem.
In general, the longer she intends to stay here and the stronger her ties to Belgium is, the harder it will be for her to successfully prove that she intends to only visit and not stay illegally. Especially if she is planning to stay for an extended period of time, like the full 90 day period, which would indicate that she doesn’t have very strong ties to her home country, like a job that she needs to come back to.
I would recommend that you limit the length of her stay, at least to something shorter than the full 90 days. And if you are planning that she will stay for 30 days, then apply for 30 days, not 90. She may still be granted 90 days (most probably), but you shouldn’t apply for a 90 day stay if she is planning to stay for example only 30 days. And make sure that you can show evidence of available funds that will cover her whole stay + some more.
If she does not have a job (retired) or have other close family in Pakistan, then it will unfortunately be harder for her to demonstrate the intention to go back to Pakistan after her stay, especially when she has a strong connection to Belgium (you). Think of everything that she could possibly show that would demonstrate a normal settled life in Pakistan. Usually a job, a business, a house/apartment, family - all those things that would make it likely for somebody to go back to your home country.
From the authorities point of view they will take all these aspects into consideration and basically make a calculation of the risk that a person would over-stay the permitted length of stay. Weak ties to her home country, strong ties to Belgium (you), a planned long stay, without enough (demonstrated) funds to pay for her stay = high risk of overstay = denied visa. She needs stronger ties to Pakistan, weaker ties to Belgium (maybe hard to do anything about), a shorter planned stay and/or more funds to cover her expenses in order to maximize her chances of getting her visa application approved.