I feed my bitch twice a day on dog mince mixed with dry food, but the last week or so she will not eat her morning feed, she has also lost weight around her belly, what can i do to make her eat?

If you are at all worried about her health (loss of appetite can be innocent but can be a symptom of something more serious) you should get the vet to examine her. How old is she, what breed, when was she last wormed etc?
:)

Weight loss should always be investigate. Please see your vet.