At this moment, we do not know the course definitively. But there's a good chance it's one of these two:
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In both cases, the race route takes us by the Swan/Dolphin along the Boardwalk. There's generally spectators there, and while there is less room for spectators to maneuver around, it is doable. Especially since the race passes right by the Swan/Dolphin she should be able to see you without much issue. Like she won't be able to stand on the bridge outside Swan/Dolphin but there are other areas. See videos below.
Here's a video from MW 2022 10k showing the Boardwalk area.
Here's a video from Princess 2020 10k showing the Boardwalk area.
It's not insane if that's what she wants to do. Again, we don't have definitive information yet, but I suspect we'll see a setup in the EPCOT parking lot like MW 2022.
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Race starts at 5am. Area opens at 3am. The corrals open around 3:55am. She can stand with you in the "reunion area", but she can not cross where the black line is heading into the corrals themselves. If you're in s6, then you can probably wait until 5:20-5:30am-ish before you'd want to make your way in at the latest. She can then maneuver around to the area North of the corrals and can get to the starting line area. She could see you off from there. Then head down towards the spectator area of the finish line.