I don't know if I'd say that she's further left than Bernie Sanders. Bernie's always been about as left as it comes in American electoral politics -- on fiscal/economic matters, anyway.
He's probably not as temperamentally radical as Tlaib, Cori Bush, Omar, etal. But I suspect you wouldn't find a great deal of ideological or policy differences between them -- with a notable exception being Israel. Sanders certainly isn't all in with Israel, now or in the past. But I also don't think it would be fair to call him adversarial in the way that Tlaib and the rest of that group is.
Anyway, there's no doubt that Kamala has always been squarely on the left flank of the Democratic Party since she came to the US Senate. There's no question about that. And of course she's trying to moderate for the election -- candidates always do that when they go from appealing to one electorate to a different one. The big difference for her is that she doesn't have as much time to do it as candidates usually do. So it all looks very disingenuous and opportunistic -- at least to me.