Should I be concerned? Trigger warning

A friend of mine has had troubles with depression and recently told me about how she struggles with suicidal thoughts. We were talking the other day and she started saying that she didn’t want to be here anymore and that she wanted everything to stop. I talked to her and helped calm her however I just got on Snapchat and saw that she posted something saying that she wanted everything to be over. Should I call her and be concerned that she’ll actually do something to herself? (She said she would never do anything)