We are confused by the housemates

[nats]

from this, it doesn't seem like she's purely responding to your text but perhaps having an emotional response to something else as well (e.g. to her perceptions of you/your behaviour generally, to her perceptions of someone/something else that might have been happening at the same time).
your text seems fine by itself, so i suspect her reaction is more about something else and therefore there may not be anything you can do but keep using the i messages and being polite, considerate, and assertive. perhaps try asking her if there is anything going on b/c you were surprised by the tone of her response text and just want to check. depends if you feel up for it though as many people who haven't done t are not aware of their own emotional responses to things.