
It sounds on the face of it that she is desperate for your attention, and she has discovered that this way gets your attention - it may be negative, but it's better than being ignored! Has
anything in your routine changed lately, whereby she is feeling left out?
In the meantime, if you stop and talk to people when you're out, get her to sit while you talk. When she's sitting you can praise her for being good, and also she can't mount your leg! When you're busy doing chores, can you talk to her at the same time (before she starts misbehaving)?
Just brief thoughts that might help.
:)