Is she okay to be doing this?

Okay so I’m from a small town in the panhandle. In that small town my great aunt owns a antique store/boutique and there is also a girl who sells the same clothing online on her Facebook page. Well my aunt, love her to death, but she seriously marks shit up and it’s ridiculous! For example I bought a hat from her one time for $40 and turned around and found the SAME DAMN HAT on amazon for $5. Well my aunt and this girl in town are both selling boutique baby clothes and since we have a baby girl on the way my MIL bought from the girl because the outfits from her are $25 while at my aunts shop they are $60+ for the exact same clothes. My aunt found out about it and messaged my MIL and told her that she needs to be buying from her (my aunt) instead of that other girl and that if she does she will give her a discount. To me, in my opinion that is extremely wrong of my aunt to do and so freaking childish. Is it okay for my aunt to message her like that or am I overreacting by being upset? These are a couple of the outfits she got pissed that we ordered from the other lady.

UPDATE

So it must just be a southern thing because we love these little outfits with giant bows. A friend of mines daughter in outfits like this for example. They are actually very cute.

Their faces are cut out for their privacy.

UPDATE #2 thank you ladies for your support. I understand that my aunt can price them how she wants but she does not have the right to tell us because we are related that we have to shop with her and no one else. As for the hateful comments like “Those are hideous” and “I would never make my child wear that”, I didn’t ask if you think they are cute🤷🏼‍♀️ I asked if my Aunt was being petty and childish. I think they are so that’s all that really matters. No one is making you buy or making you put your child in them👏🏻