[Well that's the advice she gave to Luke before, so it's not like she thinks that's completely outrageous advice. Even if she knows it's different here and that there are only so many places you can run to hide from Vader, as opposed to thousands upon thousands of planets back home.]

And how long will you be living if you run into him and try to fight him on your own?

[Because realistically if Anakin were ready to fight, there's not much time to call for help.]

Death may not function the same way here, but that doesn't mean you should freely risk your life that often. He hunts the remaining Jedi, doesn't he? He may be acting almost kind now, but how long before he falls back into those orders?