I've had it

After leaving me on read three times and not responding when I ask how she's doing, my pwBPD posted something about how none of her friends ever text her and asking what's up with that and if it's a generational thing. I'm so frustrated, I guess I don't count as a friend? This is a sign I should just go no contact, right? I'm so tempted to write her and say "I've been checking in on you but you don't respond at all so I'm taking that as a sign you don't want to be friends. Bye" but I feel like that is maybe childish and useless and will not lead to anything productive. Should I just forget it, block her, go NC? Thanks...