How we cite our quotes: (Letter.Paragraph)
Quote #4
You may justly blame me for sending my messenger empty-handed, your situation considered; and yet that very situation (so critical!) is partly the reason for it: for indeed I knew not what to write, fit to send you (87.2)
Okay, so Anna is using the word "blame" in a pretty light-hearted context. Still, both Anna and Clarissa seem anxious that the other will blame her for her misfortunes. The girls both risk a lot for friendship.
Quote #5
Had I not to console myself that my error is not owing to wicked precipitation, I should be the most miserable of all creatures (101.2)
Lighten up, Clarissa. Because our girl is so unlucky, she constantly has to remind herself that she's not to blame. Still, she manages to come across as feeling really guilty about the whole thing.
Quote #6
Is it prudent, thinkst thou, in her circumstances, to tell me, repeatedly to tell me that she is every hour more dissatisfied with herself and me? (108.3)
Clarissa sure isn't shy about telling Lovelace off. Even though Lovelace doesn't think it's the best strategy, Clarissa's using every tool at her disposal to make him cease and desist—including blaming him for her ruin.