Never noticed this until now. The Pearl in the flashback has a tutu. Only the two most recent forms had a tutu(as shown above. The picture with all of Pearl's reformations.). Even in the smaller flashback with Garnet, she still had the long socks, designed shirt, and tutu of the Pearl in "Gem Glow." The first episode of Steven Universe. This means that there was another war after the episode "We need to talk."
Also Garnet says that the above woman(in her flashback not Pearl's)is Rose Quartz. Garnet never called her that in the past(around the 70's). This is the first time she ever said it regarding to war and it was recent(at least 30 years ago). This gem has a shield and sword. It's also called Rose Quartz by Garnet who never said that in the past regarding to the Rose in "We need to talk". This shows that the Roses are different. (The Rose in Pearl's flashback may have had the sword and shield but like in Connie's book, the friend let's the heroine use their sword. Until she almost loses it and he decides to always stay by her side.)

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Steven Universe Theories (Continued)
RandomThis goes along with my previous theories! I hit the limit on the other book.