Thank you all for your replies. I'm still very torn about how to handle this issue.
I've had two other problems with her, both of which I've kept quiet about, so I'm thinking keeping quiet about things is not helping anything.
The first incident is when I called to tell them that my mother is law was hospitalized and was dying and that I needed a few days off. This supervisor asked me when I worked next, and it happened that I worked the next 3 days. She actually had the gall to say to me, "Well, if I take you off the next 3 days, then I'll need to put you on at the end of the week." Um, no. That's what paid time off is for and bereavement leave. However, feeling spineless and being overwhelmed with my family obligations at the moment, I just told her I'd have to get back with her about that, and when I called again, I spoke directly with my manager, who was way more understanding.
The second incident was the same day that she approached me about my attendance. I have recently begun having migraines, and before they were diagnoseds and before I had started on medication to control them, I was having a hard time with the headache pain. I was at work one day, about 3 weeks ago, when the pain was really bothering me, so I went into the break room to take some more advil, and I had a kind of mini-break down. She came in in the middle of it, and basically told me to get my act together. That's just background information. Anyways, earlier on the "attendance" day, she walked by me, complaining of a headache, and I offered her some advil. She turned to me and said, "No, I think I'm going to go and cry in the break room about it."
I didn't say anything ... maybe she was trying to be funny? But it hurt my feelings. I wasn'y trying to be meladramatic the day I had a problem with my headache and I hadn't asked to go home early or anything like that, so it seemed uncalled for for her to make a comment like that.
I kind of feel like she's got an issue with me ... or perhaps now I just have an issue with her and am looking for things to be upset with her about. I'm not sure.
I am going to ask to see my attendance record, because I don't think it's legal for them to penalize me for the death of my mother in law. I'm not sure if I'll talk to her then or not, though. I would like my manager's advice and involvement. Actually, I'd like to be transferred to a different direct supervisor.
Thanks again for the thoughts and opinions.