She still can't be open with Lady Russell about her feelings for Captain Wentworth and what she thinks his feelings are for her

Interesting echo to Lady Russell's thoughts about "the man who at twenty-three had seemed to understand somewhat of the value of an Anne Elliot, should, eight years afterwards, be charmed by a Louisa Musgrove" (Persuasion Chapter 13). She thinks it speaks badly of him to find someone superior to Anne, just as Anne almost can't believe that Louise prefers anyone to Captain Wentworth.

Perhaps Charles is one of the family members who believes Lady Russell persuaded Anne to refuse him because he wasn't bookish enough

It was obviously the Musgrove family story that Lady Russell persuaded Anne to not marry Charles. But it hints that they may have somehow or other heard of her influence over Anne previously otherwise it's a very big coincidence

Consider Miss Taylor (later Mrs Weston) "who had fallen little short of a mother in affection" towards Emma (Emma Chapter 1) but unlike Lady Russell the "mildness of her temper had hardly allowed her to impose any restraint; ... and Emma [continued] doing just what she liked; highly esteeming Miss Taylor's judgment, but directed chiefly by her own." (Emma Chapter 1)

Lady Russell is minimising Anne's heartbreak - she whisked Anne away to Bath to get her mind off Wentworth unsuccessfully. Anne's aversion to Bath is probably why she doesn't visit with Lady Russell each winter (it seems odd for Lady R to leave her behind)

This is really hard for a modern reader to understand. Austen has just said how sensible Lady Russell is but she too panders to Sir Walter. This may be part of the reason she rejects Wentworth for Anne; true, he didn't have money but he also wasn't important enough - were he a penniless titled person I bet she would have supported the match. Austen excels at writing well rounded complex characters, she often pokes fun at their inconsistencies.