Older female coworker is very touchy with me. Why does she do it?

My female coworker, around 10 years older than me, is very touchy with me.

She will often get very close to me when she wants to tell me something.

She's pretty busty so it's not uncommon for her to squezze he breasts into my back while I'm sitting.

She often shares her food with me and often brushes her hand "accidentally" over my ass.

Older female coworker is very touchy with me. Why does she do it?
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