Am i being selfish?

My wife works 40-50 hours a week as an Engineer and recently she decided she wants to teach class part time at a school, about 10 hours of time commitment. We dont need the extra money in fact she will probably make less because she will have to cut back on her hours at her fulltime job, which pays many times more than a teaching position. Her reason for wanting to take the part time job is because she thinks it will be fun. She is already stressed out working 40-50 hrs at her job i dont know how she will be able to handle another 10+ hours of another job. She got mad at me when I said i dont think its fair that she spends that much time at work and when she does come home she just falls alseep on the couch. I work a fulltime job too and i already make dinner every night, do dishes, laundry, take care of the dog, etc... Am i being selfish wanting her to work less hours and help out more around the house?

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