Though it took a decent amount of time for Titania to debut in the Marvel Cinematic Universe, the character's history in Marvel Comics runs deep. Considering She-Hulk: Attorney At Law has only given viewers bite-sized glimpses of Titania up until this point, there are multiple pieces of her history the show is yet to cover.
After a brief attempt at everyday and non-villainous life, Titania's thirst for fighting She-Hulk became unquenchable. However, unaware She-Hulk's power had grown substantially, Titania was quickly defeated when they fought in She-Hulk Vol 1 #10 by Dan Slott and Paul Pelletier.
Later in the issue, Titania was offered to chance to obtain the Power Gem: one of the legendary Infinity Gems. Hearing an offer from Tryco Slatterus, the former Champion of the Universe, Titania accepted the Power Gem on the condition she'd defeat She-Hulk, which also allowed Slatterus revenge by proxy for his loss at She-Hulk's hands.