Shh, MrLurcher is probably hoping not to be doing it everyday
I wonder if this has increased recently whether it is a manifestation of the stress she is feeling since she has a history of this? If so, would reducing that stress reduce the compulsion she is feeling? That would normally be the case if it's OCD related.
If it's more another compulsive disorder feeding a need is it papering over something she is struggling with?
The levels of research are familiar to me as I'm like that. Coming from an analytical work background I have to be careful with this. I still do it more than someone more laid back but I'm conscious of saving money in my case. I think this is where she needs to define the brief better so she has the parameters that allow for what is enough without the creeping that can easily occur. Then she needs to accept what is found is enough and that perfect is unrealistic. It's easy to think "but if I check xyz maybe something better will be found" but it can be obsessive and she may not always realise it at first.
If stress has increased this the opposite with be true in that reducing overall levels of stress will reduce it's intensity and make her feel she has more control of it.
I wouldn't be surprised if she also feels themes like Symmetrical Thinking. That need to rearrange sounds, to me, like part of a cycle of behaviour.