Since she is only 5mth+, i think it should be easier to wean her off now. Is she on sarong during the daytime naps or both naps and night sleep? My son was on sarong only on naps so it was not that difficult as compared to those who is 100% rely on sarong.
What I did was, initially i will let him doze off in the sarong, then SLOWLY carry him out, as I carried him out, i will gently 'rock' him and slowly place him on the place and nap with him, put pillows beside him to let him feel 'secured'. Initially he will keep waking up and even cry but this is normal. after 1-2 weeks i willmake him nap on the bed/mattress, just keep patting him until he sleep, even he cry I also just keep patting him. At 1st I took about 15-20 min to make him sleep and slowly become 10min then 5min. It takes time but it is better to wean your girl now rather than wait until she grows older. By then she will be fully rely on sarong and much more difficult to wean alrdy =)