I lost Shadowmere somewere or she is dead, or she disapeared from the game.

One minute I was fighitng a dragon on some rocky ledge by a tower. She followed me everywhere till then.

Then teleported somewere else.
No Shadowmere.

I have'nt seen her since.

I don't think she would have died. But she could have fallen.
I am on PS3. Is there any way to get her back if she is'nt dead?

If I try the bug were you wait 10 days in a major town and she comes back, I don't remember were I lost her.
Will she teleport to me if she comes back that way?
Is there anything that could bring her back or force her to spawn if she's disapearred?

Can she come back to life if she died?

I miss Shadowmere.

Have you tried fast traveling to a city since? Do that. She should appear at the stable. I had that happen. She ran off when the dragon attacked. If she doesn't and did die, she can respawn a couple game weeks later in either the Falkreath Sanctuary pool, or up at the Dawnstar Sanctuary.

If not reload the save game before you lost her.

FYI. I now leave her parked at a location near the location I'm going to. Typically a major town so that nothing like that happens.

I fast travelled to loads of places since and nothing.
I will have to hope she repawns in the pool or at dawnstar. I hope she does.

There is no save before it left. I saved over it.