KeyZOid

Answer: Wealthy Adrian controlled every aspect of Cecilia's life, so he most likely prohibited her from working - she was his stay-at-home "trophy wife." Cecilia asked "invisible" Adrian, "So why me? I'm just a suburban girl who stumbled into your life one night at a party... There's nothing left for you to take. You've already taken it all", which implies even preventing her from getting employment or starting a career. Cecilia did graduate from "Cal Poly Architecture", so she had skills/ability (evidenced by her portfolio of drawings), but she was stuck at the "aspiring architect" level. She told the job interviewer at "Ruler" architecture, "After Cal Poly, I worked in Paris for six months." That's the extent of her employment history - Adrian took over her life after that. There were no indications in the movie that Cecilia was employed when she finally left Adrian. It appears she just took the first step toward starting her career now that she had (or thought she had) her freedom back.

KeyZOid

Answer: She worked as an architect before meeting Adrian.

raywest ★

Answer: Apart from having the money to do so and portraying himself as a loving and caring husband, it was another one of Adrian's mind games and way of "screwing with her" - if she committed a crime or became mentally impaired, she would lose the trust. Adrian already had a plan to make her "lose her mind" and commit violent acts with plenty of witnesses, such as slitting her sister's throat in a crowded restaurant.

KeyZOid

Answer: So the police would believe she killed him for his money.

Answer: From what I could see, it was never specified what caused their strained relationship. Many sisters just don't get along for a variety of reasons-jealousy, resentment, rivalry, personality clashes, etc. Of course, it serves the plot and is a common movie trope that Cecilia has little family support to help with her situation, adding to the suspense as she tries to escape Adrian on her own.

raywest ★

Answer: Controlling husbands like Adrian severely restrict who their wives can see and talk to, so Adrian most likely interfered with Cecilia maintaining a positive relationship with her sister. Cecilia's sister probably did not know how controlling and manipulative Adrian was, so assumed it was Cecilia who did not want to be close to her. Adrian made it appear as though it was Cecilia's choice, but it was actually the restrictions he placed on Cecilia that caused the strain between the sisters.

KeyZOid

Answer: Because an email was sent from Cecilia but really from Adrian (the invisible man) saying that her sister was suffocating her. And that Cecilia didn't want to see her anymore.