What she just did was to compare you to some irrelevant strangers out there, and that is toxic, just like how you should not compare your kids to other kids who score better, and say why can't you do the same. This might be one of the reasons you're upset, and I think she should know what she said has hurt you. But again, this is a one sided story from you, so I hope you keep an open mind that you may have also said something that hurt her.
The amount of money is very relative to every person, every amount may mean differently. For example....
To me, I earn way less so 5k a month is A LOT, but 500 is acceptable. To her (my guess), you earning 30k is a whole lot, 5k should be easy money.
To you (my guess), 5k to "waste" is too much, because there isn't enough to spare after all the expenditures.
So I think what's missing is a breakdown of both of your expenditures.
You need to justify to her where all that money you have is going, and what's a comfortable amount you can give to her.
She needs to tell you why she wants that amount, for what, and how is she is currently spending her own money.
Both have to be transparent and open to each other's view. I understand why you say you don't expect her to contribute to the family expenditures at all, considering the fact that you make a whole lot more. But it sounds to me that at the same time, you sound a little condescending to your wife, that she is totally not spending at all for the family and her own 5k goes to branded bags. Sorry if my assumption of your thoughts came completely off, but if it has any hint of truth at all, then you ought to learn how she's spending, so that you can have a peace of mind that the amount you are about to give is an amount you're okay with going down the drain. But then again, I believe that financial planning is a must for everyone and I'm not talking about investment; I mean the awareness of your money inflow and outflow, so that you can make better decisions and plan for the rainy days.
All that said, allow me to shamelessly introduce to you my annual budget tracker spreadsheet

check it out in my signature, if you'd like to try it out with your wife
When I enquire about her money spending she says the make up I buy is so I look good for you. You don't want to be seen with a run down wife right? Clothes? Also same.
She says she wants a maid and I said no eventhough she doesn't do any house chores. I ask about her cc and it seems to be always maxed out. When we first got married I was shocked she was just paying her maxed out cc with monthly minimal payment & had to settle it by closing one of her ILP & close the cc.
Now she's back with the cc problems.