<human>: I'm a senior studying Psychology, planning to pursue a PhD in Organizational Psychology after graduation. The job that I got is fantastic, I'm working one-on-one with a consultant doing pretty much what I want to do with my PhD.  

She is paying me a lot. Especially considering I don't yet have a degree ($50/hour, before taxes). I realize that I have to take out extra taxes since I'm on contract... 

Anyway! I worked a job with her, as a note-taking intern. It was awesome. Great! Now, yesterday, she tells me that she's got a job upcoming in July that she'd already written the contract for before she hired me, but that she'd like me to tag along to learn and help out. It's about 3 hours away, will last 5 hours, and goes over lunch. In the email she used the phrasing "tag along, learn, and help out" it was not until later that she mentioned that she'd already written the contract without my expense in. I was slightly surprised, but not offended, seeing that she pays me a lot and I'm excited to learn.

I mentioned this to my father today, and his response was that if she thinks my services are worth $50 an hour, they should be worth $50/hour regardless of whether I was previously written into the contract or not. He said that she's likely getting paid a LOT and if she wants me to 'tag along and help' she can likely afford to pay me my rate regardless of whether the client is getting billed for me. 

So, basically, I'm wondering: What do you think I should do, Reddit? I already committed to being excited to learn, but my dad has made me realize that maybe I deserve to get paid? Should I go along and smile and learn and count it as water under the bridge. Is there a tactful way to bring up such a subject? Should I go along, but mention that this is a one time deal (and if so, how?)

Can you give me the gist of the text in a nutshell?
<bot>: I have an internship. Usually I get paid. One opportunity came up. I agreed to do it, but am now wondering if I sold myself short.