Is she ignoring me? And should I ignore back

Ok so my girlfriend and I have a pretty healthy relationship, we always text/call and what not. Since yesterday though, she has been ignoring me. I've tried to text her and she just reads the message and doesn't reply I know she reads it cause we both have iPhones and we both have it enabled to where you can see if they read it. Didn't really talk much this morning, just a simple "good morning" and around 12 she texted me saying she was tired and stuff so I told her if I can call for a little and she didn't respond, she read the message like 20 minutes after and I still got know response? Well what should I do? Should I ignore her as well or should just wait for her to text me first?

Talk to her and try to know what's going on (in a gentle manner). With talking you should be able to tell if she has really been ignoring you. Be patient and make a second try and even a third. After that if she keeps on the same attitude then just move on.

She's clearly going through something and you think this is a game? Go talk to her in person, I in ink she's upset about something. Ignoring will only make the problem worse. If you can't talk to her, send her a paragraph about what you're feeling and if she's okay and wait for her to reply. Don't text her after that.