She may need to talk about her feelings or just chat about her day more than you feel the need to. This is quite normal - not everybody is the same, and being the same is not a requirement of being a good couple. You do need to "meet in the middle" on many things though, so don't be so quick to cut off these phone calls. That may make her feel insecure about the relationship. There may be a way to naturally cut back on them, though.
Also, remember that there are different stages of every relationship and you may reach a point where she is content to not talk as much. This normally comes when a couple are together more often.
While you are at this stage in your relationship, rather than tell her when not to call, or that she is calling too often, why not make arrangements when to call / see each other next at the end of each date / call?
For example, at the end of a date you could say:
So I'll see you next weekend on [day/time], and I'll talk to you during the week - how about [day]?
If she says "what about calling tomorrow?" you could perhaps reply:
I was hoping to have some time for [something specific - gaming, work, hobby, whatever] tomorrow. Is it okay if I do that and then call you on [day you originally suggested].
As you have made it clear that you will see her on a specific day and call her before then, she should be in no doubt that you are not cutting her off. If she is used to the daily calls or is a little bit insecure, she might object. Be sensitive to the change and reassure her that you aren't trying to get away from her; just trying to take some time for yourself.
Some things you could suggest if she isn't happy about not calling on a particular day:
- suggest she has some time with her friends or on an interest she has?
- offer to call and "say goodnight" after you've done with your own stuff, which could be a much briefer call and show her that you are still thinking of her.