cleaner acting as an employer

Its what I call the "seniority complex". It also happens here, those who have been in the service, department or company for years would take to the newbies as if they're their seniors as far as the organization goes, like they are their "bosses" even if their level is the opposite. It's even worse if the newbie happens to be the direct supervisor of those old timers. I think the best that you can do is see if you can get her on your good side. I take it that you are in another country, it would be to your advantage if you have another filipina there, regardless of the kind of work that she does, thats on your side even if you have different jobs. Outside your work, I'm sure she knows of that country far better than you do because of the years shes been there. I would also assume that she's older than you are, maybe she's just lonely for some company and she's actually insecure of your Liston but hides it behind this air of seniority. If after being nice to her and befriending her she's still acting high and mighty to you, then maybe you can, in a subtle way, remind her that you know how to do your job and it is best that the two of you just stick to your own job descriptions. good luck, and I hope all goes well.

You are working there for 3 weeks compared to her working for 13 years. Maybe you feel she's acting like the manager, the employer or more superior- when actually she did not mean to. Why not befriended her- or try to do reverse psychology, you're a nurse anyway you know better.

Sometimes after working for a long time, they will feel as if they are the senior or worse, supervisor. This has nothing to do with their nationality but more so their ego playing a part. The best thing to do is to ignore her and keep doing what is required of you.