Yep. You joined a tiny bit after her first reprint. It used to be 2 rereprint event added each month in the past but I don't know if it's always the case since they don't re-add the event stages themselves.
Sadly, there is almost 2 years between the last rereprint event and the current reprint event. Some events (collab events) will be skipped and may makes thinks faster (if the devs don't slow the process to keep the 2 years delay...).

The best source of Rainbows Shards for Rarity Growth is from 30FS gacha. If you want to RG someone, consider this gacha (and you may end with one or more bonus 6*).

Bloomed form is only their visual 3rd form and 2dn affection scene (if you play 18+ version). Every girls came naturaly with a bloomed form. If Wolfberry is just good to use with low HP girls, Flowering Peach is already game changing (not by herself but she is a very versatile support).