The chances of her being constipated are very rare. They go when they need to go, and young BPs use most of what they eat to grow. Doesn't leave much left over for waste.
As for the aggression, I wouldn't sweat it. Snakes have individual personalities, and can have good days and bad days. Also, young BPs can be a little uppity just as a matter of course. They grow out of it as they get older and larger.
If you might have missed the pink belly or blue eyed phase of the shedding process, there is a good chance she could be about to shed. Some BPs get really cranky during a shed, and some act like it's no big deal.
Just in case she may be in a shed cycle, make sure your humidity is somewhere north of 60% to help the process along.
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