[thirdsun]

Of course I can imagine that Instagram, Facebook and Co. are more popular and accessible to her audience.

Again, I'm not recommending giving up those channels, but betting your content on a platform that will be gone/unpopular at some point (they all come and go) while abandoning the constant, central presence of your very own website, regardless of how small the following may be, seems short sighted. This has nothing to do with RSS.