To your points, in this individual’s UK standard visit visa application, she would want to show home ties and her own financial capabilities.
No one can guarantee that she’ll leave at the end of her visit, nor do your financial documents lift her obligation to demonstrate that she qualifies. Sponsorship, in actuality, can raise the bar.
She is married, living in Saudi with her husband and children. She might include, for example, information on her husband’s employment, ages of children and ongoing educational commitments, conditions under which she and her family reside there (e.g., home ownership, rental obligations. In her case, she may need to include the evidence that she is a legal resident, if her right to reside is not included in her Yemeni passport.
Edit: Her family will support her financially, and she will live at her brother's house (which is where the applicant's mother resides).
While she may not have a bank account of her own, the absence of any financial documents (her husband’s bank statements, proof his earnings, etc), may adversely affect her application.
The UK Visas & Immigration supporting documents guide is clear:
Documents you must provide
When you apply you’ll need to provide:
- a current passport or other valid travel identification
- evidence that you can support yourself during your trip, such as bank statements or payslips from the last 6 months
Read the full list of supporting documents you can provide.
Section 2: other documents you may want to provide – all visitors
This section provides guidance on the types of documents that you may want to provide to help us consider your application against the Immigration Rules.
Previous travel documents/passports, which show previous travel.
Financial documents showing that you have sufficient funds available. These must clearly show that you have access to the funds, such as:
- bank statements
- building society book
- proof of earnings such as a letter from employer confirming employment details (start date of employment, salary, role, company contact details)
- where a third party (who is either in the UK or who will be legally in the UK at the time of your visit) is providing financial support to you e.g. a business, a friend or a relative, documents to show they have sufficient resources to support you in addition to themselves and any dependant family should be provided
Confirmation of legal residence, if you are not a national of the country in which you are applying or your right to reside there is not included in your passport.
Here are my ties to my home country. Do you think they are enough? How can I prove them?
UK visa refusal on V 4.2 a + c (and sometimes 'e')
What should a sponsor tell the ECO?
Should I submit bank statements when applying for a UK Visa? What do they say about me?
Supporting documents for uk visitor visa-original or copies will do?