So, hey, Mama needs some Palutena tips. I really suck as her and I wanna not suck as her.
Generally speaking, what you want to do as Palutena is bait and punish, and when you do, punish
HARD.
Walk up, walk away, if they do something, forward smash.
Stay still, they approach, counter.
Zone projectiles, well, I think you can probably guess.
If you catch them shielding, down-throw or up-throw into up-smash.
Just don't go around smashing everywhere though, she has to pay for those disjoints somehow, and that somehow is lag.
She is a very passive fighter; you stay still, you punish, and you don't do a lot of approaching.
A few things to keep in mind: dash attack eats projectiles, Counter has a lot of start-up, but the highest multiplier of all counter moves, Reflect isn't instant, and Autoreticle sucks hard.
Just be smart with your punishes and you should be fine.