What attachment style is this?

What is this attachment style? My girlfriend seems to be secure but other times I wonder. She seems secure to me because she doesn't act out on jealousy, she is very fair ,reassuring when it matters and she just seems to not be bothered at all by most things and is very understandable.in fact most argument would be because of me but the thing that makes me wonder now is that she likes her space a lot. If I bombard her too much she gets annoyed and is most loving when I give her space. She doesn't crave attention at all. And if I should feel insecure over a silly situation she would let me think whatever I want instead of reassuring but that's only if the situation is silly. When the relationship seems to be going downhill to her she talks with me about it but she just loves her space sometimes it makes me think she is an avoidant. Any advice?