go on hiatus for a while (for many different reasons) and then return,  so that in itself would not be red flag to me. Her two current reviews are written by guys with a bunch of reviews (not first time reviewers), so again, not a red flag. If you are concerned, you could always PM the two recent reviewers. Or you could just wait a while until she gets another one or two new reivews, if it makes you feel better.

The part about mentioning rates in an email, well for a lot of ladies that is a no no, and if the client mentions rates, they cut off communication. It is usually a good idea to not mention them. However many ladies will mention rates in emails, and in the case of this provider, how else would you find out her rates? Her two ads have no mention of them. I personally have never had a problem discussing rates in emails. If they are specified in the ladies' ads or website, then there is no need, and I would not do it. However if they are not mentioned, I have asked and have been answered and never have been cut off. The red flag to me would be if they discussed rates AND services. For example, it is xxx for a bj, or xxx for fs, or xxx for anal. That kind of communication would be a red flag. but if she says my rate is x roses for 1 hour and xx for two, I don't see what the fuss is about. She is selling her time. You are paying for time.

If you are truly a newbie, and this will be your first encounter, you might consider someone else, with a few more courrent reviews, and wait on this gal. However if you really have your eye on her, for me personally, I don't see big red flags with the two issues you brought up.
Good luck.