Labrador fixating on blowing leafs

Hello!

I have a 4 month old chocolate Labrador, she's been great with learning basic commands (sit, come here, lay down, play dead, turn around)

She just recently finished her final round of vaccines, so we've started to walk her, first 5-6 times were ok, she sometimes pulls and likes to jump up on random people walking by who give her 0 attention.

Now that spring is in full effect (almost at least in Toronto) when the wind picks up and leafs start blowing around is when she starts to fixate extremely hard on the leafs (or even a cigarette butt blowing around) she will scream yelp so loud it echos off the condos. nothing I do can break it she wants whatever it is that's blowing around.

It has made walks extremely hard and quite frankly I avoid it, it's embarassing. I've tried normal treats to no luck, then moved on to hot dogs (she gets 0 human food at home) and still nothing.

We're deciding if we should hire a trainer, or if anyone has one last Hail Mary?

Thanks,