As other PPs have said, it's not necessarily about quantity, but impact. If you enjoy and can manage your schedule without becoming stressed or anxious if you have to miss a session, for example, then grand, crack on. If being thrown out of your routine upsets you, then she might have a point, but I doubt it.
I also do a lot of training for my sport, and when pre-season starts in late July, I'll be training three nights a week, in addition to two or three weights sessions a week in the gym, and probably a 'loosening-off' 5k run once or twice a week. I've always been active and fit, so it's not a huge deal, but at my age, this is the level of intensity I have to maintain if I want to continue to be competitive.
However, during off-season, I cut my training down to a couple of gym sessions a week (so as not to completely seize up!), and spend some time drinking wine and eating crisps. I also enjoy hill-walking, cycling, and yoga - I don't just exercise to keep fit, I exercise because I enjoy it.
Sounds like your 'friend' has some issues about your dedication and discipline and is trying to project her bad feeling onto you.