As someone who has had a hippie mom for 22 years, allow me to give you some gift ideas for yours. And don't worry, it's not too late to buy her something because most of these can be found at stores close to your house.
Note: I in no way am endorsing these products or their brands and do not profit from this. I merely wish to give other children of hippie moms gift ideas I've found to work well.

Bamboo Toothbrushes

Does your mom want to reduce her carbon footprint and create less waste? Then get her a toothbrush made from the fastest-growing (and therefore eco-friendliest) wood out there. Switching to these ensures that less plastic toothbrushes will end up in landfills and, God forbid, the ocean. Plus, they look cooler than regular toothbrushes. Add-on gift: coconut oil toothpaste.

Gardening Supplies

She could always use some more planters, gardening gloves, succulents, herb shears, seeds, etc. Most hippie moms have some type of flower or herb they lovingly tend to, after all, and now you can help her with it!

Camping Gear

You know she loves being out in nature. Get her a tent, a cast iron skillet, hammock, or whatever else she may need to soak up the great outdoors. It could even become something you do together to bond and experience one of her favorite things.

Diffuser

Hippie moms love essential oils, so give her another way to use them. Let her fill the air with her favorite oil for a calming or cleansing effect. Bonus: they make your house smell amazing. You could also buy her more oils to use in her new decor, we all know she'll use them.

Metal Straws

Does your mom refuse to use plastic straws ever since she read an article about how it hurts sea life? Giver her a cute set of metal straws with their own carrying cases and she'll never have to use them again. They usually come with little brushes to easily clean them and she'll get both straight and bent straws.

Chocolates

I know, I know. This is one of the most standard gifts out there. But I'm not talking about any old chocolates. Get her the really nice chocolates that are made with no artificial ingredients and ethically sourced or sustainably farmed.

Tea Gift Set

Hippie moms love the healthy effects tea has, and the taste isn't half-bad either. Find the best fair trade tea you can and add on some Himalayan rock sugar, a teapot, organic honey, a little tea infusers, or cute tea cups.

Spa Set

All moms need to relax, and I bet yours would love some bath salts that are filled with dried herbs and flowers and natural oils. Get her that nice cruelty-free organic sulfate-free shampoo and conditioner she likes. To top it off, you could buy her some natural lotion and candles from her favorite store so she can give herself a spa day.

A Reusable Water Bottle

You may be starting to notice a theme. The truth is, hippie moms hate plastic waste, and anything you give her to help her stop contributing to it will be a home run.

Crafts or Hardware Gift Card

I didn't say a specific store but you pictured your mom's favorite place to find all of her homemade goods-making needs, didn't you? If you don't know which gift to pick for her, let her decide! I'm sure she could use more paints, wood, fabric, beeswax, thread, coconut oil, or whatever rocks her handmade boat.