As long as you include their username in your tweet (@username) then your tweet will appear in their @replies tab.
If your account is private then only people that are following you can see your tweets. It doesn't matter who you are following, they must be following you to view your tweets. So, if you are following someone but they aren't following you then they won't be able to view your tweets.
Yes, anyone who is following you when your tweets are private can view them.
If you protect your updates, the people who follow you CAN see your tweets, but ONLY the people who follow you.
The only way that your tweets will appear on their timeline is if they are following you. If you want someone to see a tweet but they aren't following you then you should 'mention' them in your tweet (@username)
It means that their tweets will appear on your personal timeline. This way you won't have to go to their profile to see their tweets.
If your profile/tweets are not protected then anyone can see your tweets.When you mention someone in your tweet, that tweet will always appear in their @replies tab whether they are following you or not.
If your profile is not protected then anyone can see your tweets.For your tweets to appear on their feed, they must be following you. It doesn't matter if you are following them or not, they must be following you.If they are not following you but your account isn't protected then they can simply go to your profile to see your tweets.
Log into your account and you will see the recent tweets from those you are following. To see tweets that you have been mentioned in, click on the @username tab on the right hand side.
Unfortunately, no. If your updates are protected, only your followers can see them, includng any @replies you may make. If you've replied to someone not following you, they can't see any of your tweets, since you're protected.
If your tweets are protected then only people following you can see your tweets. If she isn't following you then maybe she has access to an account that is following you.
You can block them - you won't see any of your tweets when you do.
If someone has blocked you on Twitter, you'll be able to send tweets to them, but it won't appear in their mentions. The only way they'd be able to see it if is they unblocked you to see it. They will be able to tweet you as normal, but they won't see what you tweet them.