Yoga Frequency

So after a rough winter I've gotten back into a routine of going to yoga once a week and I have to say, it just isn't enough. Even though I've been able to stick with that pretty well, I just don't seem to be able to get any better. I still struggle with my backbends, I'm not getting any stronger. I need to go more than once a week. But if a mother of two small children is spending, three plus hours a week at yoga, does that make me superficial? Or selfish?