UK Visit Visa - Evidence

Hello

My mom is applying to visit me in the UK she is on a Malawian passport, does one have to submit 6 months worth of bank Statements? There is no current mention of the 6 months on the following guide

https://assets.publishing.service.gov.u ... ersion.pdf

She will providing a letter from her employing confirming her salary and that she is on a contract until 2023.
She will be attaching title deeds to her multiple properties and travel history for both US, Australia and other countries EU and non EU. She will be attaching her latest bank statements, her USD bank statement where she is paid and her local statement. I attached a letter of invite with my passport details and Australian passport(naturalised )

Do you think not having 6 months worth of statements will be an issue?

Thanks

She needs to provide 6 Months Bank Statements to confirm that she actually received salary as showing in her last 6 Months payslips with employer salary confirmation letter.