Helper contract renewal and salary increase

Hi all, I have had my helper for 6 years now and have just renewed her contract. I have always paid above min. and given an extra month's salary as a bonus at Xmas. She lives in with us, shares our food (as opposed to food allowance), is given weekly octopus money etc so basically could save all her salary if she wanted. Just wondering what everyone else does with regard to salary increases? There is an expectation of a raise with each contract renewal. I have offered 5% but my sense is that she wants more? Thanks.