She has a "boyfriend" (married guy she has feelings for who spends the night etc.) so its not like she's hiding that.

She has just said she wants to go visit her brother far away. Since we have a son I wanted to know in general if I could reach her in an emergency.

She said yes. Thats it. She was being so dodgy that now I was curious and eventually she said she's going out with other women for work.

Ok? She doesn't have to tell me her plans, thats not the issue. I just wanted to know for emergencies but it was like pulling teeth to find out this.

Meanwhile if she goes skydiving or on a distance trip or most regular stuff she always just tells me just so I'm aware in case of our son.

I just don't get what she could be doing thats so hard to say it for. A makeover? Male strippers? It seems like it's something she's ashamed of or something.

Ultimately it doesn't matter its just strange to me. I always just give her a heads up if I'm out in case our son bS to visit the ER which has happened a few times in the past.