Trouble finding Ashley on the Normandy! (Mass Effect 3)

Faced the following problem: I don't have Ashley on my ship (I saved her in the first part). She disappeared, after she got to the hospital, I then took her to the ship, but I could not find ((The map says that she is on the third floor on the observation bridge, BUT IT IS NOT THERE! Later, a message came that she wants to talk to me, ran around the weight of the ship, looked under every sofa, table, chair, etc., but did not find (((Who knows what kind of trouble this is ???

PS: I forgot to say that when I take her with me to the team, she behaves inappropriately! Either she constantly disappears during conversations, Shep talks to an empty place, or refuses to complete the task (at the very beginning of the game, where you need to help the turian general fix the communication tower, we still meet Garrus there, sent her to repair the tower, so the task was counted, and she ran with me and shot at the Husks! And then I couldn’t go back, because the gate didn’t open, I had to replay the mission again).
And most importantly, I received a message from Kayden!!! That he, they say, wants to meet with me in Normandy and talk!!! This despite the fact that in the first part he courageously died the death of the brave! In short, I'm confused, and I don't know what to do, who faced such a problem, please write down what to do, I really don't want to start everything from the beginning! What happens if I just don't talk to her?