From what I understand from other posters on the forum, it's difficult for Pinay to get a TRV because so many other Pinoy have abused the TRV and overstayed in Canada. The Supervisa is the better way to go and it will let your mother visit for two years without reapplying for a visa.
She will need to show strong ties that will compel her to return home, such as property, family, etc. (I doubt she has a job at 84, but if she does, include that.) Also, you should write her a letter in English or Tagalog, whichever you prefer (but must be translated by a certified translator into English or French) inviting her to stay with you for a set amount of time - 1 week, 1 month, whatever you want. She will need to provide proof she can funds to stay in Canada - you can help provide these funds and housing for her while she's here. Include copies of your bank statements or paystubs for proof you can help support her during her visit. She can provide proof of income of her own as well.
If you do a well thought out application and include sufficient proof your mother plans to return home after her visit, you will probably get the visa. There is no 100% guarantee unfortunately for anyone.
Another thing you can do is check the Manila family class sponsorship thread. The people there are familiar with the process much better than me and might be able to offer you better advice
It's okay you aren't sponsoring her, read the thread and ask for help. You can post in English, Tagalog, or any other language you like!
http://www.canadavisa.com/canada-immigration-discussion-board/-t104371.0.html
