Well first off, the fastest and preferred way is to just ask them to video chat. Since they won't even voice chat it sounds like that's not going to happen, so I would personally just write this off as a catfish.

But since you asked ill answer your question about tools

Really there are no public "tools" that go further than just reverse image searching the images, which is never accurate because images on social networks aren't archived publicly. Reverse image search only ever works if you're dealing with a really bad catfish who steals images from well known people. If they take them from a normal person chances are slim that it would ever find them. Also reverse image search is fucked by all sorts of photo editing, for example its common for catfish to crop images or heavily filter them to the point where they no longer show up on reverse image search.

Phone number lookup services might give you insight into whether or not they even live in your area (someone can use a VOIP service to get any area code they want, but it should show up as a VOIP or landline number in this case which is a huge redflag)

The biggest key will just be digging into your conversations and her profile. For example, if she has a place of work listed you can call and ask if someone by that name works there. If her Facebook url is anything interesting you can try searching that in Google to see if she has any other accounts using that url. If she has any outdoor photos, make sure they were uploaded in the right season (for example, snow photos uploaded in summer). If any of get photos are square, they were probably stolen from instagram so if she claims to not have one it's shady. See if she's in any groups. If she has any education listed you can call them and ask if a student by that name attended (I used to do this all the time for my real job, while checking people's resumes, so it's not weird)

What type of interactions does she have with people? Are they flirtatious in nature or just friendly? Has anyone you talked to been messaged by her, and if so is there any connection between them and how she communicated (for example, trying to immediately flirt with people from a specific area implies that it might be someone "revenge catfishing", perhaps someone bullied at a school that they attended.) does she ever ask them for money?

That sort of ends the ethical catfish hunting. If you want to get into the unethical stuff you can host a site and add a html geolocate parse and then link her to it, but that's really kind of messed up lol

Here's the code if you go that route:

https://www.w3schools.com/html/tryit.asp?filename=tryhtml5_geolocation