SOLVED. 1990s YA Mystery series about Horses, NOT Saddle Club

[Emily]

I'm looking for a series I read in the 90s, similar to the Saddle Club books but for older readers. I'd buy them at Walmart every time a new title came out, so they were definitely from the mid-90s. The MC helped out in the stable offices to help pay for her riding lessons, and in the first book there's a robbery and the stable's cat gets stuffed into a filing cabinet.

In one of the later books she either moves to New York City or goes there temporarily, and rides in Central Park.

I think her name might have been Kate? Katie?

It's driving me nuts because I know I found them several years ago and even ordered book one from Amazon, but it's been lost or donated and now I've forgotten the series name and titles and author again!!!

[Rainbowheart]

Triple Threat

A faint rustling caught Lucy's ear. It sounded like a mouse. She looked on the floor beside her and below her chair. She bent down to see under Sally's desk. Finally, she went back to reading.

Minutes later she heard it again, louder. There was something different too. Could it be a faint mew? Sally was talking on the phone and couldn't possibly hear it.

Lucy stood up. Quickly she opened one file drawer and then another. In the third drawer, crumpled on top of the file folders, lay Widget. She was barely breathing.

[Emily]

Yes! Thank you!!

[Rainbowheart]

You're welcome, glad to help out!