Visitor visa for mother

Hi

So i am applying for visitor visa for Canada for my mother. She used to have Vistior visa in the past and been to Canada once. Plus in the last 10 years she been to NZ and Greece as well.

So this time while applying i feel like i do not have a solid reason to write in the invitation letter and my bday already gone in March, so i cant use that excuse now.

So I have a question that we have extended families in Canada (my aunt) , she has her daughters wedding coming up in October can i use wedding as a reason that shes gonna attend,, cuz my dad already has canadian visitor visa so hes coming to attend the wedding regardless.

It would be good reason to mention this in the invitation letter plus i can attach all the wedding dates and events, when and where.

Let me know…