I got similar experience (may be the same), 3 packs of rice a month.... 1 bottle of Amway Detegent a month, 3 bottles of Olay 1.5 ml soap a month..... I do not know when she started this but at least half year before I found. You are quite intelligent. Afterwards, I found it was possible ate my herself or even with her friends. She should either sold them or sent them back home. I bought her to the agency but she declined. A warn her few times but she continued as she know I have nobody help me to take care of my children. I waited for almost another half year until I have long vacation then I fried her.
I suggest if you can arrange yourself or somebody to take care of your family, firstly talk to her, if no change, fry her. Do not think she will change.
u shouldn't keep quiet in this matter, just question her why those items 'disappeared' so fast', if no good reason given, then u should monitor everything in yr house properly!or get a new helper if she has not proved herself to be a 'trust-worthy' person。
my yan yan stole can food, cooked rice, vita lemon tea, bread and cookies and my babies' little toys.
on one sunday, i asked her to open her bag before she went out (she did not expected that i would do that), then, no deny lah, we found all those stolen items there loh. but she said: "oh, madam, i can't eat them ga?".
i told her, it might be okay that i "grant" you some food on your rest day, but don't take it for granted and please ask before you take them loh.
now, i buy some cheap can food and told her you might bring them out if you like. I hope she learns a lesson and knows what she can do and what she can't lah.