Why is my cat kneading and biting my blanket?

Female cat 10 months old. For about three days now I’ll be laying down blanket over me and she comes to bite it and knead me. She’ll bite the very top and burrow her head in my neck while biting it’s and just knead and purr. Eventually the kneading stops she lays down still biting me and just purring and then... show more Female cat 10 months old. For about three days now I’ll be laying down blanket over me and she comes to bite it and knead me. She’ll bite the very top and burrow her head in my neck while biting it’s and just knead and purr. Eventually the kneading stops she lays down still biting me and just purring and then she’ll nap. Is this her being in heat ? She’s not fixed because she’s an inside kitty.
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