Maybe it's time you discussed the facts of life and that sadly you cannot afford £500 purses and £200 sweaters. Pretending you can is shallow, uneccessary and will only attract sneers from those that know what you are playing at.
Be careful what you do - it could get to a point where copies aren't good enough any longer and she craves the real thing.
I used to work in a bank and one girl was actually buying the genuine Chanel, Gucci, LV etc. clothes and accessories from Europe. She was spending so much it was worth her while to fly to, say, Paris and stay over as the Euro was a lot stronger than it is now and the savings were high.
Sadly it doesn't take long for a family with a total income of less than £20k a year to get into more debt than it can afford with someone buying £1,500 luggage sets, £500 jackets and £100 blouses. She and her husband were eventually declared bankrupt with credit card and loan debts of over £25k plus the mortgage. Her husband was the sort of man who left everything to his wife to sort out and had no idea about the debt that was building up and that he was about to lose the home he worked so hard to pay for.
He divorced her soon after.
At least she had some nice bags to shift her stuff back to her Mums in.