Any tips on how to handle this situation?

So I've became good friends with this girl at my job ( 9 years older ) and she has been working there longer than me. When she first heard about the news she said she was proud of me, but now I've been getting this weird vibe from her.
So when she found out that our boss recommended me to take their management classes to become a manager, I said yes ( and this was offered during my 8th month of working there ) she chose me because I agreed to work full time ( even though I applied to work part time ), I always said yes to work on days even though it's a off day, I always took extra shifts, I said yes when asked to go to another company to help them out for a day ( that day I worked a double shift for 12 hours, 8 am to 8 pm ). So my boss just thought I would be perfect for the position and before I started working there my ex his words forever haunts me into thinking I can't do nothing for myself so of course I said yes when offered and seeing my boyfriend, family, friends, co-workers, being excited for me. I just thought things will go perfect but today, I saw different side of my friend and she was just giving me this weird ugly stare while I was explaining something to her, and she keeps saying " oh I forgot you were still trying to become manager " or " we're all replaceable except for Sam, the managers and boss loves her "
I honestly just don't know what to say or do.
11 mo
Sorry if this seems so long.
Any tips on how to handle this situation?
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