This looks like a form of Fleabane (Erigeron spp.), but there are other genera, such as Symphyotrichum, that also have species that appear similar. One would need to look at the floral parts carefully to say more.
Is this a cultivated plant or a plant growing wild, perhaps in Bulgaria?
Actually, the word 'daisy' is a general term that can be applied to any member of the immense Daisy family (Asteraceae), so in that sense, Chamomile, Fleabane, and Asters are all daisies.
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