Why didn't she just join in on the shenanigans?

They needed an antagonistic character.

Then who will be the main character?

>>88746920
Is this show any good? Should I start watching it? I heard it's mediocre with a once in a while good episode.

>>88746957
Well it certainly has ups and downs but for be P&F is pure gold.
Lets see.
If you more into shows like WoY/Gumball - yes.
If you more into Steven Universe/Adventure Time/MLP - no.

She's really just jealous of her brothers, the "Day of the Living Gelatin" episode pretty much explains this.

>>88746957
its very formulaic, but they use it as a strength

She's the only one who realizes how dangerous it is. Or at least that's how it was at first.

Over time constant cosmic abuse has just driven her mad.

>>88747028
For (quite) a while at least. There are limits.

Female redheads don't get to join in on shenanigans. Remember Wendy?

>one day she gives up and decides to help
>her Mom catches her and busts her

>>88746920

Candace joined in fairly often especially as the show went on.

But it was mainly a combination of her being worried about them getting hurt and that she felt like she would get in trouble for doing the kind of things Phineas and Ferb did.