Jaina sacrificed everything, including her own father, to make peace with the Horde.
As a reward for that, she gets to see Theramore nuked in front of her eyes.
Even the most reasonable, logical and calm of people change their view dramatically when confronted with what Jaina faced.
She now directs her hatred to the entire Horde, Sunreavers included, so your statement that her anger is just: "personal grudge against Garrosh" is incorrect.

MMO-Champion
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