I dismounted Shadowmere during a fight in the woods and became separated from her. Now I can't find her. Is there any way to find her without wandering aimlessly through the woods?
This is a tricky one as it's possible to actually bug out Shadowmere and have her disappear from the game completely.
A couple of different steps to try:
As I said, it is possible to completely lose Shadowmere. If your on PC there is a console command that will spawn a new instance of her next to you, but I don't know it off the top of my head.
Hope it works for you!
Fast-Travel back to Fort Farragut, and walk right up to the main doors to go in and Shadowmere will be standing there waiting for you.