Is it weird/taboo?

[courrier]

I am thinking about asking for the rec letter from a professor of the school i am applying to.

I have taken her class when she taught at my school as a visiting lecturer. We have talked a lot, about research too.

I am planning to ask letters for other school as well.

What do you think? any idea would be welcome and appreciated.

[Crucial BBQ]

She was the professor of a course you have taken and you claim the two of you have "talked a lot", including about research.  Why wouldn't you ask her for an LOR? 

[TakeruK]

Not weird at all. In my field, students often do a summer research project at schools other than their undergrad and their supervisors would definitely be writing LORs for them. And, since they know the school well, they probably will apply to at least one of the schools they've worked at. In my current program, I'd say about between 25% and 40% of admitted students spent some time at my school as an undergrad before (i.e. they would have a LOR from a prof in the program).

[courrier]

I am so late but I wanted to thank you for encouraging me to ask her! She very nicely accepted to write one for me.