If something feels "off" in your gut, it usually is. Trust your instinct man. In my experience whenever I trust my gut that something is off, it's almost always right. Then my mind tries to convince me otherwise, and pretends for awhile like nothing happened. Then I come back full circle and realize I was right. It's alright, but you have to catch it early before it spirals out of control. And what I mean by that is be willing to walk away (and do) before she has a chance to dump you, to preserve your self respect and raise your self worth. Once the red flags are there, start withdrawing immediately.
It sounds (to me) like she is losing interest. Your best bet is to cool down and step back. Let her come chasing you again.
Think of your relationship with this girl as a brick house. Until now, the house has been sturdy. No cracks, leaks, locks secure, furnace seems to be working just fine.
Now all of a sudden it's starting to break down a little. The water pipes are leaking, the locks are loose. You smell smoke but can't tell where it's coming from. Now the fire alarm is going off. Get the fvck out before you get burned.
And by burned I mean putting yourself in a position where you keep chasing her and she dumps you, taking all your dignity in the process, leaving you empty with heartache.
So just play it cool, and now that she's pulled some disrespectful sh*t by lying to you about why she didn't pick up her phone, and not contacting you, that means she has to do even MORE to earn your respect back.
Remember, it's not a matter of you winning her back. It's HER winning YOU back, and her showing you she is worthy of it after she disrespected you. Because you're the prize. From there you can either decide she isn't worth your time, or give her another chance on YOUR terms. And always make her chase you more instead of vice versa, that way you never lose the upper hand. That means if her IL is a 10, yours is a 5. If hers is a 5, yours is a 2. If hers is a 1 (like it is now) yours is -10. You get the gist of it.