Aunt standard uk visitor visa refused

[Alanm17]

Idear helper

I applied for a uk standard visitor visa for my aunt and provided the following documents
Application form
Sponsor invitation letter
Cover letter from applicant
6months bank statements for both sponsor and applicant
Sponsor payslips
Mortgage deeds for both sponsor and applicant
Sponsor British passport
Applicant passport
Council tax bill.
Sponsor
I am fully sponsoring her visit. The visa was refused because she stated that her cost of living is $400 per month. Aunt is retired and single and own her house. She earns $122 per month pension. This was sited as not enough to support her living of $400 per month. However she stated in additional information that she gets money from her son's to cover the gap and she also does peace jobs but could not evidence this in writing or on paper. The other reason was why would you want to visit a niece you have not seen for 5years. We talk frequently though over Skype, whatsapp and phone calls by international calling cards. We didn't mention this or provide evidence of these calls. Therefore for these reasons the eco was not convinced she is a genuine visitor and will leave the UK at the end of her visit.

We would like to reapply showing bank statements and supporting letter from her son's. Also we intend to provide evidence of Skype and whatsapp calls and messages although not sure how to do this without exposing very confidential messages. Please help if this is feasible and how to provide evidence that we are in constant communication. This is my aunt who looked after me after the death of both my parents. I just want to do something for her in return to visit us for 2months.

I would appreciate your response and contribution.