Seriously?
You talk every day, there was a change to that pattern with no response from her. Of course you start trying to contact her. Calling every hour seems a bit much, but calling work seems like a reasonable way to see if she is keeping up with other things in her life. Same thing happened to DH and I once.... but we just laughed at it.
DH talks to his Dad every day. Whenever we travel we always call to say we arrived at said place. About 3 yrs ago (we were 26 yrs old...) we took a disney trip, drove up from Miami. We get there and realize his phone is almost dead and we forgot to pack the charger. No biggie, we had called his Dad from the road shortly before arriving so we turned off the phone and would check it in a couple days.
We turned the phone off on Sunday, come Wednesday morning we turn on the phone to over 25 messages! Multiple calls from his dad. My parents calling us asking where we are. Our good friend K left a hysterical message about how everyone is worried and searching for us!

Our friend J, a CM, left a calm message telling us DH's parents are afraid we died. J thankfully looked up our hotel reservation and confirmed we checked in, but i guess the restaurants didn't check us off when we checked in for out ADR's so in the computer it looked like we had missed several ADR's. Everyone was in a snit and the last message said to call within 2 hours or else Orlando PD was being called.

That is when a knock came at the Hotel room door.... the front desk had been called by concerned family members to come check on us.
Now, we thought his parents over reacted a bit. They called my entire family and all our good friends to check on us. Everyone got hysterical and wound up. BUT.... we understood. DH talked to his Dad everyday and that changed. He had no clue the phone died and we talked to him before check in, not after safely checking in. In the end, we decided it was nice to know we always had people looking out for us. Kinda felt loved in a weird way.
DH actually put a GPS function on his phone shortly after this that we turn on when we travel! It's shows where we are within a 5 foot radius so his Dad can see online that we are alive. Ya know, in case 'it's a small world' breaks down and all the cherubic children turn into a murderous animatronic blood-thirsty horde.