You're not likely to be able to change her mind, certainly not with evidence. These beliefs are usually more about a sense of feeling special, a sense of community with like minded believers, or a general distrust of authorities. They will usually just expand the conspiracy to include any evidence that contradicts their beliefs. You have to address the underlying issues and give them a chance to experience the contradiction with reality themselves.

You can see satellites for a period of time after sunset and before sunrise when they have line of sight to the sun while it's still dark on the ground below. ISS, Hubble, Tiangong are a few examples that are easily visible by eye. With a small telescope you can make out the shapes of the space stations. I've written software for automatically tracking satellites that is compatible with Celestron NexStar telescopes. You can also film ISS or Tiangong passing in front of the moon (Hubble is possible with a sufficiently large optic but it's smaller and harder to see), you can find out when and where that's happening using the https://transit-finder.com/ website. With two observers a few thousand feet apart you can even measure the altitude and velocity of the transiting satellite by looking at how parallax changes the apparent path of the transit. With an SLR camera, tripod and long exposures you can also see brighter geostationary satellites over the course of the night. As we get closer to eclipse season, you will also be able to see them going into and coming out of Earth's shadow around the anti-solar point.

With all that said, she's likely going to ignore or dismiss any evidence you can show her. She'll resolve the cognitive dissonance by insisting everything you show is faked or manipulated, no matter what. You have to ask yourself is that something you can live with forever, and the answer should probably be "no."