Not so nice personality traits

At 17.5 months she started hitting us. It all started when she developed an ear infection which required us to give her antibiotics in the form of a nasty syrup. Of course she didn't like it and attempts to mix it with something else didn't always work so we had to hold her down and force it in her mouth, a complete violation of her trust. From then on she would show her contempt by slamming on the table or hitting us and say no. For 2 weeks she occasionally hits us for no reason and I believe it is to test us. Now at 18.5 months she doesn't hit us anymore or slam the table because there is no pent up anger towards us anymore.

When I scold her after she hits me, she immediately makes up for it by reaching out to kiss me because she knows what she did was wrong. It doesn't make it OK and I need to make that clear to her.

On Mar 12, we had people from church over for Bible study. There were several other kids. Allison did not like them playing with her toys or when Tom held any of them. When a boy opened this toy door, she'd slap his hand away and close it, saying no. This repeated about 10 consecutive times.

Today, same thing. We were at someone else’s home and there were 4 different kind of laptop computers. If another boy crept up to her laptop, she’s push him over with her body to edge him out. She did not like to share and I did not like to see this side of her. I made it very clear to her that she has to share and she understood bc she looked sad. 

I am reading that not sharing is normal for this young age and is something that they will develop over time. So as parents we have to promote it as best we can by modeling it with each other and encouraging her to do so.