Wow what a tough one! If you don't want to relactate & I can understand why (ouchie!) I'd consider trying goats milk. My gf DD had a cows milk allergy and that is what she drank. You can get goats milk in the supermarket. I can't remember what age she was put on goats milk but I do know my gf went back to work when her DD was about 12 mths old & was still giving her a bf when she got home from work so I am assuming that her DD had both??

This is what I found about goats milk:

'There are other alternatives: take goat's milk, for example. Patients with diarrhea, asthma, bloating and irritability may be suffering from the most common food allergy: cow's milk. Goat's milk is a natural alternative to cow milk and can comfortably be consumed by many patients who suffer from cow milk allergies or sensitivity.

Although goat milk, like cow's milk and human milk, contains lactose, many people with lactose intolerance can drink goat milk. Why? It has been hypothesized that the reason lies in goat milk's superior digestibility. Goat milk is more completely and easily absorbed than cow's milk, leaving less undigested residue behind in the colon to quite literally ferment and cause the uncomfortable symptoms of lactose intolerance.'

(sorry about the lack of commas in my post. My comma isn't working on my keyboard :-/)

It is safe to stop giving your DD formula at this age. (My DD went straight from cows milk formula to cows milk)