Other parent could be a daschund, as above, or maybe a miniature pinscher? Or, for a bit of local flavour, a Lakeland terrier or Lancashire heeler?
It matters not, if she's 6 months old then she's not going to end up huge, and a mixture is often better than a bred-to-death pedigree, I think, in terms of their future health.
The main thing is her personality and she is still young enough to be readily trained and to lose any bad habits she might have picked up. I'm you two do easily enough walking to keep her healthy.
It's the personality that counts, so if she seems healthy, happy, good with people, then if you like her, go for it!