What does it mean if you're talking to a girl on the phone but continues to talk to someone else next to her?

I'm not really used to talking to girls over the phone but there's this one girl where I talked to for 5 entire hours last night with no interruptions.

Then the next day, today, she calls me at work and said she misses my voice and that she's bored at work and that she just wants to talk. But soon after she is having a full on conversation with her co worker.

Later on, she gets off of work, and she calls me at home and she says the same thing that she misses my voice and she wants to talk but now she's talking to her sister.

Like what does this mean? She apologized and she says she feels really bad. I'm walking around outside because I don't want my family members to listen in on my conversation, so I go outside to go walk and I'm just kicking dirt around and having my head down and just feeling dumb and stupid.

I met this girl online and we have been texting each other for about a week now and we are getting along really well. We haven't met each other yet but plan on to. I'm just really confused. Did she call me to talk to me or to just waste my time?