DD1 went to daycare 3 days a week from 6months. She was near work so I could pop in twice a day to feed her so didn't need to offer anything else, but I found she responded by upping her feeds on the days we were together, and my supply seemed to adjust to handle that (I was working 3 days on, 4 off till 1, then 4 on, 3 off from 1 year). I dropped it to one feed on work days at 8ish months (but still several on home days), and none during work days from 11 months. My supply seemed to handle that fine, although some mondays (my first day at work) I'd find my coat was a little tight around my boobs by the end of the day! I was feeding during the night though too.
I'd suggest you give it a try? Worst case you end up switching to formula full time, but best case you can continue to BF for ages yet

Perhaps choose a bottle/teat that is hard work, so that she doesn't decide it's just easier to drink from a bottle as that seems to be the biggest risk, that bub just prefers the easy option and refuses the breast after a while (BF is hard work for bub too).
This time round DD2 will be too far away to visit for BFs during work, so I'll be using EBM with the new Medela teat for BF babies which I'm told is the best currently on the market in that respect. DD2 has taken it fine the few times we've offered.