Cass' emotional problems, from this arc, are all solved at the conclusion of this arc by the single act of fighting with Bruce. Regardless of the fact that 80% of them were unrelated to Bruce.
Yes, the fact that she doesn't know how to read shows up again as a problem shortly thereafter, but it's a separate event, a *new* problem. For a comparable issue, imagine an arc where Two-Face recruits Scarecrow and Croc, and the three of them go on a rampage. Bruce, after eight issues of exhaustive combat and detective work, brings in Croc. He then flies off into the night smiling, and Two-Face and Scarecrow aren't even mentioned again. Then, four issues later, Scarecrow shows up once more, in a scheme completely unrelated to Two-Face or Croc or anything he was doing last time, after not a single mention in the intervening issues. That's what happened with Cass, here.