My ex sees everything I type in chat. Changing my pasword did not change a thing. There is a possibility that the video chat is seen as well but this may be by inference.

There would be no way anyone, who knew an old password could logon as you when you change your password. So, I think this person is pulling your leg, if in fact you have already changed your password.

Unless she is a member of that chat.
Start a new chat after changing passwors, its Impossible
ABD VIDEO is ONLY 1-1 so NO way anyone else can see it

if memory serves, it IS possible for someone who is ALREADY signed in as you, to continue seeing your chat exchanges with a third party

the key is that they don't do anything else besides lurking, because as soon as they do, they are notified of the pw change and asked to sign in again

I have not tested this with the current Skype version, but there was a time when this was the case