Being Christian does not mean one is not feminist. This person seems to advocate for a multitude of things including ones that are historically feminist (of at least one commonly accepted variety of feminism). Those advocations make it reasonable to call her a feminist.

I didn't mean that one cannot be a Christian and a feminist.

I meant that this person chooses Christian venues to voice her opinions, and shares with them non-feminist values such as being "pro life", etc.

Hers is not a feminist organization, and Collective Shout is perceived by some as a right-wing group seeking to also ban LGTB+ depictions in videogames (which is not standard feminist agenda). Like another commenter mentioned, Collective Shout receives funding from evangelical organizations. And really, you have to ask yourself: since when exactly payment processors paid any attention to what genuine feminist organizations had to say about anything?

At some point you cannot ignore the evidence anymore. At best you can point the non-empty intersection of conservative Christian groups and some sex-negative feminists who both seek to ban pornography, but this doesn't make them the same thing.

TL;DR this is a variation of "will somebody think of the children!?" pearl-clutching, and everyone should know by now it doesn't lead to anything good.