I'm not sure if you have access to the BW books but there are some good examples in there of way to do it
I'll try to paraphrase one from the Toddlers book (I know your LO is 9 months but I think you could apply the principles) - first step Tracy suggested was twice a day to put LO in the crib when she is happy for some play time, literally just a couple of minutes and distract and engage her if she is upset, jump up and down, play peekaboo, get some toys out, give the message this is a fun place! And take her out while she is still happy, building up over a couple of weeks to 15 mins or so twice a day. Then gradually move away from the cot a bit, tell her what you are doing but occupy yourself in the room doing laundry or something - basically building her confidence in being there alone. You may find after a bit you can pop out of the room for a minute, make sure she knows you are coming back, then do so.
Once she's happy with that Tracy suggested tackling the nursing to sleep for naps (not sure if this is an issue for you? If not then just skip forwards!) by taking her off the breast as soon as she starts drifting off to sleep, putting her back on if she cries, then again taking her off as she starts to drift off. In the example in the book I think she suggests trying this for 15mins, taking a break for 20 mins or so then going and trying again, until she is able to fall asleep for naps with you there but without nursing.
The last stage was tackling nights - do you have a partner who could help out? Basically Tracy's advice was to go to LO when she cries at night, comfort her, stay with her, pick her up and cuddle her but do not nurse. As soon as she calms, put her down again. And repeat. Essentially PUPD
For breastfeeding Mums it is often easier for a partner to do this but you can do it yourself if you need to.
I guess at 9 months it is slightly different to a toddler in that some 9 month old breastfed babies will still have a night feed, though many don't. What I would suggest is that you set yourself a clear plan of when you are willing to feed - say not before 5am. And you use the plan above for all wakings until that point - including say she wakes at 4.30am you keep reassuring/PUPD until she goes back to sleep even if that goes past 5am.
What do you think?