Would you believe me if I said that I've wanted to read this pairing for ages? And I'm so taken with the way you've done it, the way you turn the two of them into full and interesting characters with fascinating motivations, the world you've placed them in, the backstory you've given them.
I love the realism with which you paint their relationship, such as their late-night discussions turning into mere 'good nights', or Bathilda sleeping with her face turned away, so as not to disturb Griselda with her snoring. (And it speaks volumes that she'd still do so after Griselda had left.)
Bathilda didn't always recognise Griselda these days, but most of the time, she still knew her Dearest.
Painful and beautiful.
Then there's the irony of love causing harm -- in Bathilda's case as well as Griselda's -- but the way you portray these characters, we understand and believe that to them, there's no alternative; their choices make sense, difficult as they are.