If you want a cheaper version of the UA cold gear that still works well, Uniqlo has (or they had a couple years ago) a line of cold-weather compression shirts that works great and is reasonably priced.

Agree with a vest! I got one at Dick’s two years ago that is Second Skin brand. Layers are the way to go, as she may warm up faster than you think. (I’m also a runner and my wardrobe is down to a science when it comes to temperature. I prefer a fleece headband type warmer to a full hat. I actually have a Buff brand wrap thing that can be used as a headband, neck warmer, hat, it has like 20+ ways to finagle it (there’s a video on how to do it). That’s a key item for me too.

+2 Nike Hyperwarm, UA ColdGear, or similar. Regular (cheap) fleece leggings aren't good for staying warm during athletic activities - they'll just hold onto sweat and make her colder. She needs sweat-wicking base layers designed for sports, and then can add regular sweatshirts/sweatpants on top if necessary for extra warmth.

Oiselle or SmartWool base layers - I wear them to run in the winter and find them warm but still breathable.

https://www.oiselle.com/shop/running-tops/long-sleeve/flyte-long-sleeve
https://www.rei.com/rei-garage/product/146266/smartwool-merino-250-base-layer-quarter-zip-top-womens

+1 to Nike Hyperwarm or UA cold gear. Try on though because they both run tight, which is generally a good thing for sports unless they're too small.

For gloves, look into football gloves for cold weather, with a tacky palm if she's playing a stick sport.

Nike hyperwarm collection is quite good. You can find it at TJ Max and Marshall’s fairly cheap around this time of year.

Look into a nice vest...not a puffy one, but something runners would wear. That allows for a lot of arm movement, but will keep you super warm.
On days when it's cold but sunny and I know I'll warm up quickly once I get going (I'm a runner), I wear short sleeves and arm warmers (cute long socks that I've cut at the toe), and those are easy to remove after I've warmed up.

Under Armour cold weather compression shirt
Running gloves, light weight, fitted. I have a pair of Saucony I really like

I have a DD who need some good gear for her outdoor practices. We have fleece leggings, but I'd like a warm top (not bulky) and gloves that will still allow her to hold her stick.

TIA!