Is she trying to secretly ruin my relationship?

At first I kind of thought this girl just disliked me. But I've mentioned that my boyfriend and I used to argue a lot. Once I came into work and wasn’t talkative and kinda kept to myself.

She found me twice and asked if everything was ok and why I wasn’t talking to her that day which is odd because she isn’t the type to do that for anyone else and I barely would talk to her. before, she would initiate and I would giggle at everything she said which maybe she liked because she would start smiling when I did it.
Anyways she’s kind of my superior at work. Not my manager but she’s cool and around my age. We’re both in our early 20s. She just takes her job seriously too. I don't know if she likes when I talk about my boyfriend because she gets quiet or will say something awkward.
Also before I would text him at work just a quick message and she would be fine with it. I’ve seen her on her phone and taking pictures at work too. After a certain amount of times though I think she’d be bothered by it. I started calling him sometimes at work which I admit was wrong but she got really harsh.
Once I called him while on the floor at work which was a huge mistake and she called me out for it and I never did again. The next time was during closing hours which she would eventually tell me to hang up because she felt I couldn’t help close at the same time. She would even say something when I was texting him which a lot of people do.
The weird time it happened was one night her and I were closing with one other guy. I had clocked out and we were standing at the front leaving. It was getting quiet and I called my boyfriend. She told me to hangup so I told him “I love you too” and she said I shouldn’t call him until we’re leaving which we were. We went to the door and we’re literally at the entrance and I called him again and she told me to hangup again and said I couldn’t call him until we were outside which was so weird.
Why is she trying to make sure I don’t call him?
Is she trying to secretly ruin my relationship?
Post Opinion