It's very typical for babies to suddenly find something that was comforting or interesting to be scary. Don't look for reasons for it--they just turn on a dime, mentally. Please don't try to "get her over it" by reintroducing toys that now scare her, because no matter how often you tell her "It's fine, it's safe" and so on, she is simply too young to be able to process that or take comfort from words. Her mind cannot yet do this: "It's the same toy that was nice yesterday. It hasn't changed. I liked it then and it is the same and I see it does not bite/jump/whatever." She has very few settings to her mind, and they are very basic: This thing is fun, this thing is scary, this thing is comfy, this thing itches/hurts/pokes me. It requires some rational thought to get from "This scares me but I remember that it was fun before" and she's not there yet. She won't be for a long time.
Please be aware that versions of this will keep happening even as she gets older so you need to be prepared for it and recognize it as normal, and not as something to "work on" so she gets over it. For instance, many kids will be just fine going to sleep in their own rooms and then, overnight, they're scared by something they can't really identify -- it could be a blanket that has always hung over the back of a chair, that all at once appears like a scary monster to them by the light of the nightlight when it did not, before. It's not rational but it's normal. And don't expect her to be able to answer you when you ask, "What's wrong? It's the same room, nothing moved." She might just say "I'm scared" without being able to identify why and that is normal and OK. Don't press her to give you answers or identify her fears early on if she can't do so; instead, she needs comfort rather than toughening up. Eventually you'll come up with routines to help banish monsters in her room, and give her some "magic spells" to say to make her more confident or whatever it takes, but don't push a child to try to get over a small, irrational fear. It can make the fear worse, not better.
If something avoidable and unnecessary like a toy or blanket or picture on the wall scares a kid, just remove it for now and don't over-talk the fear. Just make the item go away.
I would strongly suggest that you get some solid books about infant and young child "ages and stages" that talk about these kinds of developmental stages so you know what to expect and don't mistake a normal lack of rational thought for something being really wrong. There is a series of age-based books with titles like "Your One Year Old," "Your Two Year Old" and so on, by an author named Louise Bates Ames, and those are a good start. There are "What To Expect" books not just for pregnancy but also for early years of childhood. Also, ask your pediatrician and you will find that this behavior is normal and will take other forms for some years to come.