Do you sync to the same computer which has both your and her purchases on ? If you do then she should be able to sync them to her phone from it.
If you use different computers then you could copy them from your computer to her computer (if they are not on your computer then you could re-download them on it). You can find where they are stored on your computer by right-clicking (control-click on a Mac) one of them in the Apps part of your iTunes library and selecting 'show in explorer' ('finder' on a Mac). You can then copy them to, for example, a flashdrive and then add them (you will need to authorise your account via the Store > Authorise This Computer menu option) to her computer's iTunes via File > Add To Library and she can then sync them.
If you log into your account on her phone or her computer and re-download those apps on it then you risk tying the phone or computer to your account for 90 days : http://support.apple.com/kb/HT4627
The problem is that the Apps were purchased on your account but your wife's iPhone is signed on to the App Store on her account.
Sign off her account on her iPhone, re-sign-in on your account (on her iPhone) and then re-download the Apps directly to the phone. You will have to always do this until you purchase the Apps via your wife's account.
You can also do the same thing through iTunes, but you will end up with two copies of the App (one will have the number 1 tagged-on to the name).