[X] Since all of the searching is going to be about lamias only indirectly, and a lot more about curses, Lotte could *try* to find information and books about Lamia. How likely she'd be to succeed and then get much useful out of it is… unknown, but perhaps it's worth trying?
[X] Ask more about the monastery above. What would the people up above do if they learned there was a lamia beneath there. Did the Nachtmater ever visit? What could be done to divert them if they did?
[X] Frederick was handsome, if a little strange. Would it be perhaps a little foolish to hang around and get to know someone better, just because you feel an entirely superficial and likely fleeting attraction to them? Yes. Is Lotte in fact eighteen years old? Also yes.
[X] There was apparently one researcher already here. That meant a new person to meet and greet, and while this could end really, really badly considering that Lotte was now a lamia, perhaps they'd be a friend. And if not, one could still learn things.
[X] Exploring the area in general could be done even if you didn't expect to find works. Look at everywhere there is, figure out what this place is even about.