Here’s my take on this.
You have a couple of straightforward options, each with its own set of pros and cons. The most integrated solution is using Apple’s native “Find My” app. Since you both have iPhones, it’s designed for this exact purpose. You would need to enable location sharing from her device to yours. The primary benefit is that it’s built directly into iOS, so it’s battery-efficient and doesn’t require any third-party downloads.
Another popular choice is Google Maps. It has a robust location-sharing feature that’s easy to set up. An advantage here is its cross-platform nature, in case one of you ever switches devices. Both are reliable tools; it really just depends on whether you prefer to stay within the Apple ecosystem or use a more universal app.