As you are already used to this type of intercourse, there is no reason to get any problem whatsoever. You may need to consult a gynecologist to find out if there are some structural problems.In this case vaginal examination is a must.
Well, this is just me. If it hurts, tell her and stop using them. If it is part of her turn on to use them it will (hopefully) be less so if you tell her you don't like it and it doesn't feel good. She's not a guy so doesn't have the feeling to know how far to naturally go and when to stop. Life really is not like porn. :>) Just be honest. If you want a satisfying relationship, she should be able to handle that you don't love her toys. You love her instead. good luck
For me since I had my last son, sometimes it hurts because it seems like my cervix is lower at certain times. My husband penetrates me with no problem most of the time but some times with toys that are too stiff (for lack of a better word) they hurt. My doctor saw something and asked about pain during sex so I know it is just a problem with the way my body is shaped. My advice if a certain toy is causing you pain, try a different one that is shaped differently or not so ridged.
Everyone gave you great advice. If this has been part of your sex life for years and it's just now starting to hurt then it sounds like something may be going on. See your Dr because you might have an infection. Yeast infections will burn and itch. Bacterial infections sometimes will not burn but sex can be painful if you have one.
If neither of these are the problem then you might want to get very soft and smaller toys and make sure to use a lot of lubrication. I recommend a water based lubrication that can be bought almost anywhere.