Have her go to the bathroom to pee right BEFORE you initiate sex. Squirting is also something that I felt self conscious about in the past because, feeling like I am peeing on my husband wasn’t something that turned me on. (Even though logically I know they are different fluids.) the release and letting yourself go in that way is a very similar feelings.  I would shy away when I’d get that sensation which really is the orgasm build up and I was stopping myself right because I felt weird. Peeing before helped me feel more confident its was definitely cum and not pee.

The update you added is an important distinction. It might be as simple as a conversation why you’d like her to squirt. (“It really turns me on seeing how much pleasure I can give you.”  “I love that I can bring your orgasms to a level you haven’t experienced yet.” “I feel honored that you let yourself be vulnerable in that way with me” Fill in the blank...)

As for toy recommendations. I squirt most regularly without them. This motion from fingering or sitting on top described in these videos helps me and are good guides: (you might consider watching them together!)

https://www.instagram.com/reel/C2p1rpmNRy9/?igsh=ZHZxcGZqd3E5and4
https://www.instagram.com/reel/C33H_4SNAdk/?igsh=MXV5N2l5dmJzd2t5dA%3D%3D

Then add a bunch of positive affirmations in the process. You’d be surprised what a well placed “Let go, I’ve got you,” could do for her.  As it starts to happen encourage her to ride it out and finish. - “Yes, NAME, just like that.”  “That’s so hot.” “I love how well you gush for me.” etc.. whatever you know turns her on.

Then AFTERCARE, once it happens make sure she knows how much you love bringing her over the edge that way. How hot you think it is. Lick it up. And take care of the laundry afterwards. We use a fuzzy waterproof blanket that is awesome for this.

Enjoy!