pat

we have a dwarf jack who is about 8yrs. old she was a rescue due to her owners passing.we have had her about 6yrs. no health issues at all until a week ago. she started pawing at one side of her mouth.we thought maybe she bit her tongue,but we cannot see anything in her mouth. she drinks water&is eating but it takes her longer to eat than usual. in the past couple of days she has had a terrible smell coming from her mouth. is this a sign of an illness or what? please help! we have 3 of her "kids"also(1&2yr.old)