If you open them you open themif you don't you don't. Who cares.Can u define ghost her though? Like she has snapchatted me a few times in last day or two. so just open and ignore them or don't even open them?
Be too busy for her. Do your own thing. Go meet new women. If you hang around waiting on her this will show her you havr no options and her interest will plummet even further. Ghosting means you have nothing to do with her for a duration of time, week, month or so, giving her time to either miss you or not even notice you weren't there. If she misses you then you book the date. If she doesn't care, you next her.