How am I supposed to determine the donation amount of a girl that doesnt list a price?

Just ask her. If she doesn't want to say, move on to someone else.

Call her and ask her. Asking a woman's hourly rate is no the same thing as talking about sex.  Do not ask her what you get for the money unless you want to get hung up on.

Rates are listed.  You can also ask her to confirm, but don't say anything beyond that...

I just don't see them.

It makes me think that there's something fishy going on, and I've heard tales that that is exactly what happens.  (Upselling, bait and switch, etc.)

Well, You can ask if she has an ad or a web site.  If no, then you must ask what is her "requested donation" for the desired interval "for her time & companionship."  You might ask if the rate is "all inclusive", especially if the rate is lower than expected.

I recently saw an ad that listed starting from $xxx. Guess what, I'll not be calling.  I'm not an ATM.
skb

first, check if she's reviewed here and check to see if the info is there

if you're intrigued enough to call, call and tell her you're interestes but that there was something missing from her ad page that you would like to or need to know to see if seeing her is something you're interested in pursuing...she should figure it out by then and you can find out at that point

heinous