how do i know when my champ is fed/hits their powerspike?

lets just take diana. i dont play her but i think she is a good example. half the time i see dianas, they literall q+r and im dead. they can be 1/0/0 and they explode me. how do i know when my champ reaches this point? how do i know "i can kill this dude in 1 combo" or "he will most likely survive and then turn on me and might kill me" i know people say to just focus on your champ and play them a lot, but what if im new to a champ? there has to be some way to tell this stuff earlier instead of playing like 50+ games where you feel clueless
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