Sure.
If you completely ignore the part where after Shar abandons her and she retains her powers Shadowheart says "I guess we know who was granting my powers all along"
Suggesting that it's not the goddesses passing over responsibility for Shadowhearts power, but it's always been Selune.
It's an observation made by the protagonist in that dialogue, that her goddess (Shar) abandoned her: "admitting who empowers her
now might break her spirit".
On the evil run Shadowheart
kills Selune's daughter and becomes Shar's chosen,
it would make even less sense for Selune to grant her powers then.
